Kaseki (カセキ) is the artisan of Ishigami Village. With expert skill and precision formed by his numerous years of experience as a craftsman[8], he is a key member of the Kingdom of Science, responsible for creating many of their scientific inventions.


Kaseki is a bald, short, old man with a large, white beard. Although initially appearing to be frail, when fired up, he bursts through his clothes, revealing a muscular body, likely honed by his years working as a craftsman.


Kaseki is an honest older man who is prideful in his work and skill as an artisan. Unassuming unless provoked, he displays boundless energy when excited about his work.

Originally wary of Senku, Kaseki quickly becomes a loyal and prominent member of the Kingdom of Science. His love for crafting since his childhood helps him form strong bonds with advocates of science. Having been relatively isolated for much of his life due to his interests, he now considers Senku and Chrome as close friends, despite their age differences. He is alike to them in the fact Kaseki is passionate about his craft and despairs when it fails.

A genius craftsman, Kaseki picks up techniques with little effort. Upon seeing glass for the first time, he immediately understood how to work best with the material.

As one of the oldest members of the Kingdom of Science, Kaseki is relatively wise. He often imparts wisdom on the other members, and is unafraid to admit his own shortcomings.

Despite his pride, Kaseki often seeks external validation for his work, particularly from women.

Abilities and Skills

Master Artisan: Kaseki is an master artisan with over fifty years of experience. He designed and built much of Ishigami Village, including the island's bridges. He also made Kohaku's shield, originally for her father Kokuyo as a reward for winning the village tournament and becoming chieftain.

Kaseki picks up new techniques extremely quickly, inherently understanding how to use materials he's never seen before. He can craft objects solely from Senku's diagrams with little practice. He's even able to create extremely complex structures, including engines and vacuum tubes. Senku admits that Kaseki's skills far surpass his own.

Intelligence: Along with Chrome, Kaseki is one of the original two members of Ishigami Village with scientific knowledge. He's shown to be extremely knowledgeable, particularly about crafting techniques.

Physical Abilities: Kaseki's physical abilities are high, despite his old age, due to his physically-demanding work, and they were further heightened after Kaseki was revived thanks to the healing properties of the petrifaction process. He is strong enough to tear through ropes. However, he has limited combat experience.


Just like the rest of the village, Kaseki is a primitive human. Kaseki is also a descendant of Byakuya Ishigami and his crew. In his youth, Kaseki loved crafting all manner of creation. However, this made the other villagers look at him with disdain as a result. Kaseki built the bridges that connect Ishigami Village and started creating shields for the tribe.


Kingdom of Science Arc

Kaseki is introduced as one of the inhabitants of Ishigami Village. Upon hearing rumors of Senku, a boy from outside the village, he found it curious.[9]

Suika borrows lacquer from him to aid in making the generator.[8]

In order to create glass vessel, Chrome solicited Kaseki's assistance, tying him up and dragging him back to Senku. The old man at first refused to help them due to his treatment, but became intrigued by their attempts at glass work. When Senku and Chrome attempted to amateurishly blow glass and fail, it infuriated him to the point that he broke through his bonds and took over the process.[8]

Along with Chrome, Kohaku and Suika, Kaseki aids Senku in making gas masks in order to acquire an antibiotic for Ruri.[10]

Ginro tries to rationalize his lack of help in gathering sulfuric acid, saying that it's a given he would be scared since there's a risk of death. He criticizes them for being reckless while posing as being brave. Kaseki interrupts him by saying he's showing his own weakness by running away and saying nothing, then painting them in a bad light over it.

As Ginro tries to protest, Kaseki tells Ginro that he's not weak at all - fear being a key feeling for survival. The former adds that every human feels fear deep inside. Kinro who has a blurry disease is about to fight Magma, and Kaseki says he surely must feel fear. However, with a reason and for the sake of what's precious, someone can eventually beat that feeling of fear. Kaseki intentionally leaves the additional gas mask for Ginro.[11]

Village Games Arc

Kaseki plays a crucial role in village games as he suggests winning over the village tournament to acquire alcohol to Senku, prompting the latter to join himself.[12]

Kaseki comments on Ginro's selfish attempt to win the village games himself after misunderstanding Ruri's formal statement that she is indifferent about marrying the winner of the competition. He states that Ginro is even worse than Magma since he has no ill intent behind his actions.[13]

Once Senku defeats Ginro by using Suika's helmet as a fulcrum for his spear and hitting him in the groin with the other end, Chrome faints in the next round and Senku is crowned the winner of the bout. Once the latter gets hold of alcohol, he immediately divorces Ruri and snatches Kaseki so they continue working on the cure. He shows of a spinning bamboo structure he made to the group, wanting girls to praise him. Instead, he gets praised by Senku, much to his chagrin. When asked about its utility by Gen, Kaseki says he has no idea what it could be used for.

After Senku tells Kaseki to look forward to tomorrow and leaves, Kaseki grabs Gen and orders him to watch the creation along with him so he doesn't get lonely. As Gen protests, he accidentally rips Kaseki's clothes and reveals his muscle, prompting Gen to comply.[14]

Once Ruri is finally cured, Kaseki comments on her immediate tomboyishness upon recovery, concluding it must run in the family.[15]

Vs. Hyoga Arc

Kaseki crafting katanas.

As Suika arrives to the battle between Kinro and Magma, Kaseki is relieved to see that she is well.[16]

After Senku became the village chief, Kaseki helped in the advancement of the people in his ways. For the village's advancement, Senku, along with Kaseki, start forging Japanese swords for all their warriors.[17] Senku explains how the task of making these swords is very difficult and tedious, but Kaseki easily learns it. Kaseki was able to make enough swords to equip every capable fighter in the village.[18]

Once the village is set ablaze, Kaseki worries about the spread of the fire. As Suika leads the invaders away from the village, she is congratulated by Kokuyo and scolded by Kaseki for her recklessness.[19]

Communications Arc

The craftsman marvels at the possible creation of a cellphone, its properties and its usage as a wartime communication device. He enthusiastically observes the schematics for its making along with Chrome.[20] Senku briefly explains how the voice's small output of electricity is amplified by the cellphone, creating electromagnetic waves which are then received on the other end. The craftsman shares the joy of eating cotton candy made by Senku alongside the rest of the village. [21] Kaseki, along with Chrome, spends three days to build a water wheel/mill. Senku knew about the invention, but is nonetheless greatly surprised the two have achieved such level of craftsmanship without possessing any prior knowledge. The water wheel was then used, along with the cotton candy tool, to create an electrical water powered generator.[22]

The craftsman club is getting worn by Senku more and more, with Kaseki and Chrome complaining about the amount of workload imposed onto them. Together with Senku, the duo learns about the functioning of gears, making batteries along the way. Kaseki notes that while before he was lazing around in the village, ever since Senku arrived, things have gotten more interesting and fun. The old craftsman states most of the village feels the same way.[23] When the record player is made, Kaseki is amazed to hear the recording of Senku's father, the founder of the village. He is left in awe at the song of Lillian Weinberg.

He aids in making a tank to attack Tsukasa's forces.

He later aids Senku in freezing Tsukasa to save his life.

Age of Exploration Arc

Kaseki aids in building cameras and a hot air balloon.

He makes a car to travel.

Kaseki aids in building the Perseus and finishes it in a year.

He joins the Perseus as part of the crew.

Treasure Island Arc

On the way to Treasure Island, he is among those that give Yuzuriha a detailed description of the ship.

Much later, he and the others are petrified by Kirisame under the orders of Ibara. Kaseki's body is shattered and tossed into the sea by Ibara and his men.

He is rescued by Taiju, Ryusui, and Soyuz and is the third member of the Kingdom of Science to be depetrified. Kaseki is excited at witnessing petrification and his rejuvenated body before he is disappointed at the state of his vehicle.[24] He is recruited to help Senku make a drone.[25]

He and Ryusui notice Chrome and asks what his plan is, after he starts to dash ahead.[26]

He is later petrified again by Ibara but not before playing his part in Chrome's plan.[27]

After the battle, he is later depetrified again to repair the Perseus. He along with the others revive their friends. When Whyman attempts to petrify them but fail, Kaseki is shocked to hear that he sounds like Senku.[28]

New America City Arc

Kaseki is later seen remarking on Chrome's speculation of the Whyman, bringing up the matter on why the Petrification Weapon was on the island. After a new warrior was revived, Kaseki is seen running with Chrome, Ryusui, and Senku back to the ship. He asks Ukyo if the signal of the enemy is nearby and Senku reveals he is on the moon.[29]

As the Perseus sets sail to return home, Kaseki questions whether the ship will be huge and Senku tells him that they will travel the world to gather materials suitable for space travel. [30]

Working with Yuzuriha, the two are tasked with creating a globe. The two recall Senku's remarks and feeling energized at his audacity, they create a massive diagram, complete with cities. Seeing this unbelievable display, Senku remarked they went overboard.[31]

He is very excited to reach land.[32]

Kaseki is later excited at the thought of modifying the enemy aircraft, once the others are worried after learning they had a second one. He and Senku also decide to build a runway for the ship.[33]

While working on the ship, he joins the discussion of Luna with Senku and Ryusui. He remarks on Senku's logical way of dealing with her. He is later seen excited by the recreation of ice cream. After Senku expresses familiarity with Zeno, Kaseki wonders how Senku knows him.[34]

Kaseki and the crew were later captured after Stanley and his unit attack.

Kaseki would be liberated by Max at the request of Luna and Francois.

South America Arc


Senku Ishigami

He finds Senku's stories about science amazing and eagerly builds the invention. He respects Senku as his new chief and a person while Senku values his capabilities.


Kaseki is on good terms with Chrome due to their similar interests in science, craftsmanship, and material gathering. The two often work together on projects like glass and vehicles.

Gen Asagiri

He has been said to have a soft spot for Gen. When the Kingdom of Science splits into different groups for a project, Kaseki almost always takes Gen aside to work with him. Kaseki is the only person who can force Gen, who is normally able to outwit anyone, into helping him (mostly because Gen is intimidated by the old man's physique).

Yuzuriha Ogawa

While the two don't have too much interaction together, the two get along well as fellow artisans. Both are close to Senku and often help him create his more complicated and intricate inventions. Kaseki helps build her a loom and is saddened when he believes it was not what she wanted. Similarly, when Senku assigned them the task of building a 3d model of the Earth based on his plans, he claimed it was fine for it to be sloppy but both Yuzuriha and Kaseki got angered by his remark, saying that as fellow craftsmen they could not allow their work to be poorly handled and both shared the same level of satisfaction and excitement at its completion.[31]

Chapter Appearances

v  d  e
Kingdom of Science Arc
13. Part 1: Stone World: The Beginning Absent
14. Those Who Have Faith Absent
15. Two Kingdoms of the Stone World Absent
16. Kohaku Absent
17. Nasty Looks Pictured
18. Sorcery Showdown Absent
19. Two Million Years of Being Absent
20. Stone Road Debut
21. Dawn of Iron Absent
22. Survival Gourmet Absent
23. The Smooth Talker Absent
24. Lightning Speed!!! Absent
25. By These Hands, the Light of Science Absent
26. A Shadow Alliance Absent
27. A Certain Scientists Wish Absent
28. Clear World Absent
29. Senku's Lab Appears
30. Death Green Pictured
31. Friends Have Each Other's Backs Pictured
32. Brain & Heart Appears
33. Baaad Chemicals Appears
v  d  e
Village Games Arc
34. Sneaky Grand Bout Strategy Appears
35. The Masked Warrior Appears
36. Kinro and Ginro Absent
37. Science-User Chrome Absent
38. Master of Flame Absent
39. And the Winner is... Appears
40. Two Million Years in the Making Appears
v  d  e
Village Origins Arc
41. Doctor Stone Appears
42. Tale for the Ages Absent
43. Humanity's Final Six Absent
44. One Hundred Nights, One Thousand Skies Pictured
45. Epilogue of Part 1 (End of Part 1) Part 2: Stone Wars Pictured
v  d  e
Vs. Hyoga Arc
46. Stone Wars Appears
47. Science Vs. Power Appears
48. Blades of Science Appears
49. To the Present Appears
50. Humanity's Greatest Weapon Appears
v  d  e
Communications Arc
51. Sweets for the Stone World Appears
52. Age of Energy Appears
53. Hard Knocks Crafting Club Appears
54. Flickering Blue Jewel Appears
55. Treasure Dungeon Push Start Absent
56. The Treasure Appears
57. Heat Hear Appears
58. Wave of Science Appears
59. Voices from Here to Infinity Appears
60. Angel's Song, Devil's Whisper Appears
61. Stone Wars Begin Absent
62. Double Chase Appears
63. Information Warfare Appears
64. Hotline Appears
65. Call From the Dead Appears
66. Liars and Truth Tellers Absent
67. Full Mobilization Appears
68. Flame of Revolution Appears
69. Steam Gorilla Appears
70. Paper Shield Appears
71. Prison Break Absent
72. Experience Points Appears
73. Top-Secret Mission Appears
74. Fateful 20 Seconds Absent
75. 20-Second Countdown Absent
76. Final Battle Absent
77. The Power of Science Absent
78. That Which Destroys or Saves Absent
79. For This Very Moment Appears
80. Humanity's Strongest Tag Team Absent
81. Fingertip Absent
82. Epilogue of Stone Wars (End of Part 2) Appears
v  d  e
Age of Exploration Arc
83. Dr. Stone Appears
84. People = Power Appears
85. Ultimate Resource Appears
86. Money Absent
87. Senku's Department Store Appears
88. Wings of Humanity Appears
89. Adventures Absent
90. New World Map Absent
91. Need Bread? Start with Wheat Pictured
92. Desire is Noble Absent
93. The First Shot Is Yours Appears
94. The Scent of Black Gold Absent
95. First Contact Appears
96. Eye of Science Appears
97. The Joy of Leadership Appears
98. Ryusui Appears
99. Kingdom of Science Photo Journal Appears
100. Origin of the 100 Tales Appears
v  d  e
Treasure Island Arc
101. Treasure Chest Absent
102. Perseus, Ship of Science Appears
103. Light of Hope and Despair Appears
104. Men of Forensics Petrified
105. The Island's Great Beauty Petrified
106. The Secret of Petrification Absent
107. To the Trump Card Science Vessel Absent
108. Two Trump Cards Absent
109. The Great Escape Absent
110. Beautiful Science Absent
111. Science Wars Absent
112. King of Three Dimensions Absent
113. Cryptography Science Absent
114. Silently, Science Pierces the Stone Absent
115. One Second, One Grain Absent
116. Miracle in Hand Petrified
117. The Kingdom of Science Strikes Back Petrified
118. Silent Soldiers Petrified
119. Science Soldiers Appears
120. Top Secret Absent
121. Medusa's True Face Pictured
122. Brain-Battle Puzzle Pieces Appears
123. The Battle of Wits' Deal Game Pictured
124. The Invention of God and the Devil Appears
125. The Decisive Three-Dimensional Battle Appears
126. A 3-D Strategy Absent
127. Medusa and Perseus Appears
128. Island-Wide Battle Royale Appears
129. Joker Appears
130. Devil's Choice Pictured
131. Nasty Crimes Pictured
132. The Strongest Weapon Is... Appears
133. Flash of Destruction Pictured
134. Commander Faceoff Petrified
135. Counting Petrified
136. Medusa Vs. Science Absent
137. Last Man Standing Absent
138. End Of Part 3 Appears
v  d  e
New America City Arc
139. First Dream Appears
140. New World Plots Appears
141. First Team Pictured
142. World Power Appears
143. Ryusui vs. Senku Appears
144. Ryusui & Gen vs. Senku & Kohaku Pictured
145. Bar Francois Appears
146. Bar Francois: Bitters Appears
147. Science Journey Appears
148. Pioneers of Earth Absent
149. Light Lure in Darkness Absent
150. Righteous Science User Absent
151. Dr. X Absent
152. Doctor Vs. Doctor Appears
153. Science Wars Appears
154. Spy vs. Spy Absent
155. Science Is Elegant Appears
156. Two Scientists Absent
157. Same Time, Same Place Absent
158. Who's the Scientist? Pictured
159. Lock On Absent
160. Gunshots Echo Appears
161. Craft Wars Pictured
162. Down the Earth-Stained Path Appears
163. Multifront Final Battle Appears
164. Re-Lock On Appears
165. Know the Rules, Make the Rules Absent
166. Ultimate Knight Absent
167. Different Strokes Absent
168. Corn City: Population One Million Appears
169. RISK or HEART Pictured
v  d  e
South America Arc
170. Staring Up at the Same Moon Pictured
171. Staring at the Same Light Appears
172. Marked with an "X" of Wisdom Pictured
173. Earth Race Appears
174. The Specter of the Panama Canal Appears
175. Ultra Race Across South America Appears
176. Net-Breaking Battle Plan Pictured
177. Medusa Mechanism Pictured
178. Science Scales Mountains Pictured
179. Bonds on the High-Wire Pictured
180. Sickening Yet Beautiful Appears
181. New World Science Appears
182. Diamond Heart Absent


  • His name, Kaseki, is the Japanese word for Fossil.
    • This seems to be a joke about his age.
  • Kaseki has a habit of ripping apart his clothes when he gets excited, even while wearing difficult-to-produce clothing crafted by Yuzuriha.
  • He ranked 9th in the 1st popularity poll and 14th in the second poll.
  • Kaseki appears to be particularly fond of their vehicles, as he is shown distraught when they give the first car an upgrade [35] and after they repurposed parts of the mobile lab. [36]


  1. Dr. Stone Manga: Volume 4 — Q&A
  2. Chapter 99
  3. 3.0 3.1 Dr. Stone Manga: Chapter 178
  4. Dr. Stone Manga — Chapter 103, Kaseki is Petrified along with majority of the Perseus Crew.
  5. Dr. Stone Manga — Chapter 119, Kaseki is revived by Senku.
  6. Dr. Stone Manga — Chapter 134, Kaseki is shown to be petrified
  7. Dr. Stone Manga — Chapter 138, Kaseki is revived again.
  8. 8.0 8.1 8.2 Dr. Stone Manga: Chapter 29
  9. Dr. Stone Manga: Chapter 20
  10. Dr. Stone Manga: Chapter 31
  11. Dr. Stone Manga: Chapter 32
  12. Dr. Stone Manga: Chapter 33
  13. Dr. Stone Manga: Chapter 39
  14. Dr. Stone Manga: Chapter 40
  15. Dr. Stone Manga: Chapter 41
  16. Dr. Stone Manga: Chapter 35
  17. Dr. Stone Manga: Chapter 47
  18. Dr. Stone Manga: Chapter 48
  19. Dr. Stone Manga: Chapter 49
  20. Dr. Stone Manga: Chapter 50
  21. Dr. Stone Manga: Chapter 51
  22. Dr. Stone Manga: Chapter 52
  23. Dr. Stone Manga: Chapter 53
  24. Dr. Stone Manga: Chapter 118
  25. Dr. Stone Manga: Chapter 119
  26. Dr. Stone Manga: Chapter 133
  27. Dr. Stone Manga: Chapter 134
  28. Dr. Stone Manga: Chapter 138
  29. Dr. Stone Manga: Chapter 139
  30. Dr. Stone Manga: Chapter 140
  31. 31.0 31.1 Dr. Stone Manga: Chapter 142
  32. Dr. Stone Manga: Chapter 148
  33. Dr. Stone Manga: Chapter 153
  34. Dr. Stone Manga: Chapter 155
  35. Dr. Stone Manga: Chapter 70
  36. Dr. Stone Manga: Chapter 116

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