Dr. Stone Wiki
Dr. Stone Wiki


One day when Tsukasa was young, he went to a beach to collect seashells, intending to use the shells to create a necklace as a gift to his infirm sister, as she loved tales of mermaid princesses.[1]

While collecting seashells for Mirai, an old, drunk fisherman appeared and violently attacked Tsukasa to the point that his face became unrecognizable. The fisherman justified his assault on Tsukasa, claiming that he owned a fishing permit in the area and that Tsukasa's harvesting of seashells was trespassing. This event would greatly affect Tsukasa's view of humanity.

Sometime after this, Mirai became clinically brain dead, and as a result required constant life support. Unwilling to let his sister die, Tsukasa trained and became a top-tier fighter in the MMA in order to financially support his sister's medical care. His combat prowess eventually acquired him the nickname of "Strongest High School Primate", and made him famous enough to be known by even the likes of Taiju, someone who doesn't watch television; his fame is implied to go further, being widely known internationally.

Prior to the petrification, he made an appearance on a psychological magic show, he met the mentalist Gen Asagiri.


Stone Formula Arc[]

The "Strongest primate high-schooler"

Petrified Tsukasa

He is briefly seen by Taiju in his petrified state. After Senku and Taiju encounter a pride of lions, they are forced to revive Tsukasa in the hopes that he will be able to fend them off. This proves to be successful, as Tsukasa repels the lions by killing one and scaring off the rest. As a result, Tsukasa joins them and for a time forms a trio with them. Tsukasa covers the weaknesses of Taiju and Senku — he defends the group from natural threats, and provides sustenance for them in the form of meat and fish. This allows Taiju and Senku to focus on their respective strengths, bolstering the group's productivity.[2]

Vs. Tsukasa Arc[]

A schism forms between Senku and Tsukasa when the two are alone on the beach. Tsukasa tells Senku the story of how he was assaulted by a fisherman, when he had been collecting seashells for his sister before a surgery of hers. Following the conclusion of the story Tsukasa smashes a petrified man in the water, "killing" him.

Tsukasa explains to Senku his motivations; he believes that the petrifaction of the whole world is an opportunity for humanity to be cleansed, and for humanity to live in a natural utopia where only the "strong and pure" live, untainted by the corruption of modern technology. Tsukasa tries to turn Senku to his side, by arguing that they should only revive the innocent, young people of the world.

Senku, however, is wholeheartedly against this notion; Senku declares that, with the power of science, he will save all of humanity without exception — even those who Tsukasa considers evil.[3]

Taiju and Yuzuriha mourn Senku

Tsukasa seemingly kills Senku.

Returning from his trip to harvest nitric acid for the revival of Yuzuriha, Taiju, oblivious to the events that unfolded while he was away, accidentally reveals to Tsukasa the vital component in the Revival Formula. After the three return to their shelter, Senku is forced to give up the location of the nitric acid water to Tsukasa in order to make time to revive Yuzuriha and make a plan against Tsukasa.[4]

Tsukasa makes his way to the cave as directed, and deduces that the miracle ingredient in the cave water is nitric acid. Following this, Tsukasa quickly returns to the shelter. In his wake Tsukasa destroys many petrified humans, leaving a trail of rubble behind him. He returns earlier than expected, much to the shock of Senku.

Taiju realizes what Tsukasa did while he was gone when he sees the rubble of smashed, petrified humans in Tsukasa's hands. Senku sees that Taiju is about to start a fight with Tsukasa over the matter, and attempts to intervene by using a crossbow. Tsukasa, however, manages a superhuman feat; he catches the arrow loosed from the crossbow midair and sends it into the ground. He deals a strong kick towards Taiju's head, sending Taiju flying. Tsukasa is surprised to see Taiju still standing, but is even more surprised that Taiju hadn't tried to attack back. Realizing that Taiju would not fight to protect himself, Tsukasa threatens Yuzuriha, causing Taiju to faint. Tsukasa ends the quarrel and leaves the shelter, now an enemy of Senku, Taiju and Yuzuriha.[5]

Tsukasa returns to the shelter sometime after Senku and company leave, and discovers that the group left the shelter hastily. This, combined with Senku's words regarding the uses of seashells, leads Tsukasa to the conclusion that Senku is planning on creating gunpowder in order to use it as a weapon against him. Tsukasa realizes that Senku will need sulfur in order to produce gunpowder — which can be found in abundance in the hot springs of Hakone.[6]

Tsukasa quickly makes his way over to the hot springs, and finds Senku's location as a result of the smoke coming from the beacon fires he created. On the way to the fire, Tsukasa finds Yuzuriha and takes her hostage. Tsukasa confronts Senku with Yuzuriha in tow, threatening to kill her by placing his spear against her throat. Senku is forced to divulge the recipe for the petrifaction revival formula in order to save Yuzuriha's life.

Tsukasa gives Senku another chance to live — his life will be spared if he promises to cease all his efforts in progressing scientific development.[7] Senku refuses again, telling Tsukasa that such a promise would be impossible for him to make.[8] Following this adamant refusal, Tsukasa instantly kills Senku by crushing his cervical plexus.[9] Yuzuriha and Taiju create a diversion using a rock and gunpowder, fleeing from Tsukasa with Senku's corpse.[10]

As the explosion from the gunpowder settles, Tsukasa throws his burning clothes away. He concludes Taiju never intended to hurt him, simply creating a diversion so he could retrieve Senku's corpse and escape with Yuzuriha. He thinks to himself that it would be impossible for Senku to recover from the wound he inflicted since there's no professional medical help available[11]

Kingdom of Science Arc[]

Now alone, Tsukasa notices someone following him, locates them and asks them who they are. As the stranger reveals themselves Tsukasa notes she is half-japanese and has blue eyes, asking himself whether Taiju just revived her. He is then assaulted by the girl and makes a snarky remark about the rude greeting. The girl angrily says he will do his greetings in hell. After a brief clash, Tsukasa is amazed by her fighting prowess, having never heard of anyone that looks like her in the martial arts world. His opponent informs him she saw Tsukasa killing "the sorcerer gentleman" in exchange for saving Yuzuriha's life and states she will take no excuses. Tsukasa is surprised by the usage of the world sorcerer to which Kohaku replies that Senku summoned the mountain's wrath to combat him. He concludes that the girl isn't a modern timer and that she is a descendant of someone who depetrified in the past. He gets relieved, saying that he could kill the primitive group of villagers at any time and heads straight to the miracle cave as Taiju and Yuzuriha now know how to make gunpowder. In one go, he slices a tree that immobilizes Kohaku.[12]

He depetrifies Gen and sends him to investigate Kohaku's village and find out if Senku is alive. Gen returns and lies that Senku is dead.[13]

Vs. Hyoga Arc[]

Tsukasa is shown to have amassed a great deal of physically powerful people at his side.[14]

Tsukasa at some point revives Hyoga as well, a warrior renowned for his skill in spearmanship. The two supposedly agree on their ideologies of "culling" the current population as the world cannot hold all 7 billion people. Through Hyoga, Tsukasa learns that Gen's reports were forged and that Senku is alive and amassing the tools intended to defeat him.[15]

Communications Arc[]

Considering they need a significant portion of manpower to prepare them for the winter, in his conversation with Hyoga, the latter adds that Senku's Ishigami Village is surrounded by water. Storming the location even during the frozen waters in winter would require a wasteful supply chain. Tsukasa agrees that the decisive battle is to be fought in the spring.

Hyoga inquires whether Taiju and Yuzuriha should be allowed to roam freely. Tsukasa replies that they should be carefully monitored, but not cut off. The important thing is to keep the knowledge that Senku is alive hidden from them, in case they don't already know. Even if they are double agents, they have no means of conveying information to Senku.

Tsukasa states that what the group should focus on is a preemptive strike from the Kingdom of Science instead, as Hyoga replies that Homura is standing watch, albeit with an information delay too as there is no means of direct communication either on their side.[16]

Later on, he pays respect to the fallen warriors who died at Ishigami village before discovering a phone was buried in the ground.

Tsukasa agrees to a ceasefire with the Kingdom of Science after Senku promises to depetrify his beloved sister, Mirai. Tsukasa is told because the stone formula can heal a wound, it should work for his sister. Tsukasa shows the location and finds his sister's statue. Senku poured the formula on her and Mirai was revived while awakening from her coma. Happy at seeing her, Tsukasa embraced his sister.[17]

Senku and Tsukasa celebrate their victory

The duo celebrates victory.

Their peace is short-lived, however; he is soon betrayed by Hyoga. Hyoga attempts to kill Mirai but Tsukasa takes the hit. Tsukasa and Senku defeat Hyoga, he is critically injured and put into cryosleep.

New America City Arc[]

Senku plans to return to Ishigami village to petrify and then de-petrify the frozen Tsukasa, with the petrification device onto his body together with Mirai and other Kingdom of Science team. Tsukasa is then happily reunited with his sister again. He then asked Senku what the situation is before he is stunned to hear it was invading the moon to defeat the Why-man.Tsukasa is approached by the new addition Matsukaze, who is curious about his skill and challenges Tsukasa to a sparring match. Tsukasa accepts and easily bests his opponent who is in awe at the feat, while surrendering. Tsukasa notes that Matsukaze might be a real challenge in the future. At Gen's request, Tsukasa joins the others in recreating his scars with paint to commemorate his loyalty to Senku.[18]

As preparations for the global voyage are ongoing, Tsukasa expresses his appreciation of Gen, who demures, claiming he only takes advantage of other people’s skills. When concerns arise about the potential for corrupt individuals to be revived during their journey, Tsukasa reassures his allies that he won’t allow villains to ruin their plans. When Ryusui mentions a prize of Dragos for spotting land first, Tsukasa expresses confusion, before Minami rushes Ryusui away. Tsukasa seems to overhear Ryusui’s conversation with Minami about the positives of money.

Later, after the Perseus sets out to sea, Tsukasa is interviewed by Minami, and he states his intent to protect the integrity of science from the schemes of corrupt people and guns. During the poker game between Ryusui and Senku, Tsukasa comments to Chrome that Kohaku took Senku's replacement cards from the middle of the deck. After the game, Tsukasa dresses in new clothes made by Yuzuriha, and receives a custom cocktail made by Francois.

After the party ends, Tsukasa was sullen at hearing Matsukaze's past before an inebriated Matsukaze requested that he trained him. Although Matsukaze apologized for overstepping, Tsukasa decided to start weapons training for the crew’s fighters. To this end, he asked Senku to revive Hyoga, believing that he was better suited to teach the warrior weapons. Hyoga agreed but requested that other fighters be revived and soon they started training aboard the Perseus.[19]

Very soon, the ship reached land and Tsukasa was pleased with this.[20]

When the Perseus arrives in San Francisco, the warrior team follows the exploration crew. Soon alligators attack, though Tsukasa was pleased because of the dwindling supplies. With that he and the other warriors defeat the beasts, they soon use the Alligator meat to restock on supplies. Tsukasa is exceptionally pleased with the hamburgers that François made from them. Tsukasa then shows one of the Alligators had swallowed an ear of corn and Senku realized gathering corn might be in grasp. [21]

They continue to find corn that has been scattered through the river. That night, the crew set camp before Tsukasa note on an eerie feeling. He smells smoke from a gun and alerts everyone to retreat inside the boat, where they could take cover. Surely enough, bullets rain down and Tsukasa ducks for cover in the lab. After the gun stops shooting, Ryusui has the group enter the boats before fleeing the scene. [22]

The group escape on the river, but hears an engine, before Tsukasa is shocked to witness an aircraft flying above them, staring at it in awe. Fortunately, Senku comes up with a plan and has Kirisame bring the plane down with a substance, as the pilot escapes. Senku has the plane salvaged, wanting to use it in the future while Ryusui supports this plan.[23]

With the enemy temporarily held off, Tsukasa tells the group that it is most likely they will fall back to strategize. Tsukasa watched as Senku sent Gen, Chrome, and Kohaku to scout the forest for the enemy.[24]

When the crew get a call from Chrome and Kohaku, Tsukasa told them to minimize the conversation because the enemy might be monitoring their frequency. He watches Senku hang it up because the enemy might track them. Surely enough, the enemy Dr. Xeno makes contact, with Tsukasa shocked by this even more so when he requests to speak with "Dr. Taiju". Tsukasa hears Senku realize this was a ruse to protect him from harm. Once Taiju refused Xeno's offer of servitude at the urging of the others, Tsukasa heard a noise and was shocked to spot another plane flying above the Perseus. He notes how the enemy is taking a new strategy by flying above them. He watches Senku prepares a new tactic, as he announces to the crew that he and Kaseki are building a runway for the Perseus.[25]

Tsukasa then calls a meeting, having an artist draw a diagram of the present situation. He and Senku agree on sending a small group to capture Xeno to have a chance of defeating the enemy. Tsukasa, Hyoga, Ukyo, and Suika then set out into enemy territory.[26]

Tsukasa and his group soon arrived at the colony fortress, where they find Chrome and Kohaku surveying. The two are relieved because of the extra help. However, they soon get a message from the Perseus in our shocked when it is revealed that Senku was shot. Chrome realize that everything now depending on him as the last scientist of the kingdom.[27]

Chrome soon came up with the idea to create a drill, an impressed Tsukasa and Ukyo already knew what it was a drill. [28]

To prepare the drill, they have Hyoga create a hole with his spear. They are surprised when Taiju arrived with the drill and Carlos Barrios, one of the enemy colony members. Tsukasa was pleased by this. While surveying the fortress, they note radio waves could be tracked.[29]

Afterwards, they get a message from the Perseus and it is Luna Wright who has become the new girlfriend of Senku and her words cause Carlos to side with them.[30]

Sometime later, they are able to tunnel through the ground to the castle, ending up in the livestock area. Sneaking through the castle, Tsukasa and the others defeat the enemy soldiers and reaches Dr. Xeno. Tsukasa then holds the shocked scientist at sword point. [31] [32]

South America Arc[]

After taking a rest on a small island, they discover Chelsea across the continent is via motorcycles, prompting Senku to create a roadmap in the steps needed to make one.[33]

While observing the enemy, Tsukasa soon witnesses Maya Biggs suddenly halt, questioning on why. When Maya says that her "instincts as the all-American women's-division MMA champ" are telling her something. After this, he is surprised when Maya immediately spots where he, Kohaku and Hyoga were hiding. Realizing they were seen, the group decide to engage in combat.[34]

Maya going all out

Maya going all out against Tsukasa.

Both sides begin a small brawl, and at the start of the fight the Kingdom of Science seems to have the upper hand. During the battle, Tsukasa impedes Maya after the latter pushes a tree towards Kohaku to crush her. Upon hearing his name, the soldiers that were accompanying Maya to the battle realize he is the MMA champion from Japan. This fact absolutely delights Maya, who begins to target him and goes all out. The occurring battle is very fierce, Tsukasa even mentions that its the furthest he's ever been pushed in battle, before knocking her down in a single blow. After this, one the soldiers uses Maya's defeat to take out Tsukasa with a gun. Regardless, Kohaku accomplishes the mission of destroying the communicator before she too is dispatched. The mortally-wounded Tsukasa later awakes at nightfall, noticing the footsteps left by the Americans and the broken transceiver on the ground. He spots Hyoga's lifeless body, shrouded in shadow. Tsukasa compliments them to himself, commenting that they finished the job and that he expected nothing less. In the distance past some rocks, Tsukasa also sees Kohaku's bloodied body and comments they don't have much time left.

Before he dies, Tsukasa thinks about the power of the petrification device. He wonders if it can even heal the dead, thinking about how it healed his sister and himself from near death, wondering that perhaps only in-tact cellular structure is required. He then laughs at his hope, wondering when he decided to entrust his fate to Senku and his science. With a backdrop of stars despite the dense jungle canopy, Tsukasa dies saying that "what I once sought to destroy has become a shining star of hope" leaving the rest up to Senku.[35]

Tsukasa is later petrified alongside the rest of his comrades as the petrification beam that was launched from America reaches South America.[36]

New Stone World Arc[]

Three years later, Tsukasa's statue is collected by Suika who was revived earlier. She places Tsukasa with her other collected allies.[37]

After the revival of everyone else, Senku revives Tsukasa, whose injuries were healed. Tsukasa then inquires Senku about Hyoga who is the next to be revived and is in awe when Hyoga is revived with all of his injuries healed. Tsukasa and Hyoga later hunt several animals and use their pelts to make new outfits for everyone. The same night, Gen tips off Senku to go talk to Tsukasa who is waiting for him by the water wheel hut. Tsukasa confides in Senku that Hyoga died from his injuries long before he was petrified and the two now safely come to the conclusion that the revival formula and the Petrification Weapon can essentially make humans immortal. [38] Tsukasa imagines a dystopia where the power of the Medusa is abused to keep people from natural deaths, while Senku and Xeno try to ease him as the exact limitations of the device are still unknown and testing it isn't exactly possible. Eventually the immortality granted by the petrification is kept a secret between Senku, Tsukasa, Chrome and Xeno, whom Senku and Tsukasa were in agreement when they revived earlier, since Stanley is also agreed to be kept out of the picture.[39]

Tsukasa, along with Matsukaze and Ginro, remain in South America to keep gathering minerals and working on the engine for the rocket.[40]

Globetrotting Arc[]

Tsukasa states that even though he does't think Xeno would turn on the KoS, part of the reason he stayed behind in South America was to keep Xeno secure.[41] He however remains there with Matsukaze and Ginro for a long after Xeno has left for Japan.

Moon Mission Arc[]

Tsukasa returns to Japan with Ginro and Matsukaze just in time to take part in the selection for the moon mission.[42]

His seat in the Moon Mission along with Ryusui and Senku, seems to have been secured for quite a long time[43], but he eventually steps down from it as he deems Kohaku to be a better pick for his position.[42] Later Ryusui steps down too and suggests that Stanley is revived and send to the moon his stead. Tsukasa is in complete agreement with his plan, as Stanley no longer poses a threat, and he even offers to accompany Xeno in reviving Stanley, while other members of the KoS are shocked by the suggestion.[44]

Tsukasa shows up as part of the crowd that sees the astronaut team off and he offers words of assurance to Kohaku and Stanley.[45]


  1. Dr. Stone Manga — Vol. 1 Chapter 4, Tsukasa alluding his past to Senku.
  2. Dr. Stone Manga: Chapter 3
  3. Dr. Stone Manga: Chapter 4
  4. Dr. Stone Manga: Chapter 5
  5. Dr. Stone Manga: Chapter 6
  6. Dr. Stone Manga: Chapter 7
  7. Dr. Stone Manga: Chapter 8
  8. Dr. Stone Manga: Chapter 9
  9. Dr. Stone Manga: Chapter 10
  10. Dr. Stone Manga: Chapter 11
  11. Dr. Stone Manga: Chapter 12
  12. Dr. Stone Manga: Chapter 16
  13. Dr. Stone Manga: Chapter 26
  14. Dr. Stone Manga: Chapter 48
  15. Dr. Stone Manga: Chapter 50
  16. Dr. Stone Manga: Chapter 52
  17. Dr. Stone Manga: Chapter 79
  18. Dr. Stone Manga: Chapter 141, Pages 14 -19
  19. Dr. Stone Manga: Chapter 146, Pages 14 -19
  20. Dr. Stone Manga: Chapter 147
  21. Dr. Stone Manga: Chapter 148, Pages 14 -19
  22. Dr. Stone Manga: Chapter 149, Pages 14 -19
  23. Dr. Stone Manga: Chapter 150
  24. Dr. Stone Manga: Chapter 151
  25. Dr. Stone Manga: Chapter 152
  26. Dr. Stone Manga: Chapter 153
  27. Dr. Stone Manga: Chapter 160
  28. Dr. Stone Manga: Chapter 161
  29. Dr. Stone Manga: Chapter 162
  30. Dr. Stone Manga: Chapter 163
  31. Dr. Stone Manga: Chapter 166
  32. Dr. Stone Manga: Chapter 167
  33. Dr. Stone Manga: Chapter 172
  34. Dr. Stone Manga: Chapter 187
  35. Dr. Stone Manga: Chapter 188
  36. Dr. Stone Manga: Chapter 192
  37. Dr. Stone Manga: Chapter 195
  38. Dr. Stone Manga: Chapter 197
  39. Dr. Stone Manga: Chapter 198
  40. Dr. Stone Manga: Chapter 200
  41. Dr. Stone Manga: Chapter 201
  42. 42.0 42.1 Dr. Stone Manga: Chapter 219
  43. Dr. Stone Manga: Chapter 209
  44. Dr. Stone Manga: Chapter 221
  45. Dr. Stone Manga: Chapter 223