Ukyo Saionji (西 (さい) (おん) () () (きょう) Saionji Ukyō) is a modern-day survivor who was revived by Tsukasa Shishio.

He is one of the Five Wise Generals of the Kingdom of Science. He always proposes the use of non-violence, but will relent if not possible. Because of this, he will push to use Gen's mentalist trickery. Ukyo is in charge of intel gathering and security.


Ukyo Icons.png

Built similarly to Senku, Ukyo is a slim, yet toned young man of average height, with short, blonde hair and blue eyes. He has round, boyish facial features and often sports a laid-back look on his face. He wears a long, baggy orange top with a loose turtleneck and is rarely seen without his signature, matching paper cap. He's always carrying a bow and quiver on his back, the sling of which features decorative fur of some kind. He wears long, fitted khaki trousers and distinctively-pointed brown loafers.

Like most modern timers, he has a petrification scar on his body but it is unknown where. He later recreates his unknown scar, as a sign of loyalty to Senku.[8]


He is pacifistic and dislikes needless bloodshed. While he initially joined Tsukasa's empire as he believed it to be the only way of survival and looked away from Tsukasa's breaking of statues (which is the equivalent of murder), he chose to side with Senku and his kingdom of science under the condition that not a single life would be lost.

When Senku fulfills his promise, Ukyo fully sides with the Kingdom of Science. He is notably intelligent, managing to quickly deduce that the Lillian talking over the telephone was Gen in disguise and managing to keep Senku's allies alive while they were in the Tsukasa Empire without alerting Tsukasa's suspicions. He also prefers to use his archery to corner his opponents rather than outright murder them though may be willing to murder if forced to.

Abilities and Skills

Super Sensitive Hearing

As a result of his long career as a sonar technician while working for the SDF Navy, Ukyo now has extremely sensitive hearing which allows him to locate a target with pinpoint accuracy by sound alone.

Archery skills

He has tremendous skill with archery, managing to shoot arrows at Magma and Chrome that made it look as if he was trying to pursue them, but purposely shooting so they would hit close to their bodies, but miss. In addition, he is skilled enough to shoot an arrow to save Chrome from falling in a waterfall. It is unknown whether he learned archery before or after the Petrification.


While chasing Gen, Magma and Chrome Ukyo lured them into bushes where it would be harder to avoid detection through his ears. When Chrome created a smokescreen he took advantage of it by using it to conceal his own position while moving and shooting arrows. Despite Gen managing to perform a perfect imitation of Lilian's voice, he was able to tell that it was Gen simply from deducing that Gen wasn't tired from singing for a long period of time like how the real Lilian (or any other singer) would be after singing an elaborate song.

Linguistic Proficiency   

Ukyo is shown to be bilingual, as he is able to speak both Japanese and English. He spoke English to Senku using his buried phone in order to conceal their conversation from the others present.


2/5 D
3/5 C
5/5 A
5/5 A
Ukyo's stats, according to Volume 8


Not much else is known about his past but before he was petrified along with the rest of humanity, Ukyo was a sonar technician in the SDF navy.

After being depetrified, Ukyo serves as one of Tsukasa's top lieutenants as a scout.


Communications Arc

He finds Gen, Magma, and Chrome while they are setting up a phone and he corners them with his arrows. He captures Chrome. He lies to Tsukasa that they were going for more revival formula, and not making a phone.

After the battle, he along with Nikki are in shock that Senku is planning to create a refrigerator.

Age of Exploration Arc

He helps the others with depetrifying Ryusui and Francois, with Ukyo being amazed by edible meals, finding oil, and Senku letting Suika have a pet. [9][10][11]

During the boat test run, Ukyo and the others receive a transmission from an unknown person.[12]

After returning to base, Ukyo officially becomes recognized as the Kingdom of Science's Five Wise Generals. They began discussing the new phenomenon and Ryusui dubs the person as the Whyman, something Ukyo comments on. They begin to think Whyman may have been behind the first petrification event and found a way to revive themselves. Ukyo is later impressed by Senku creating a radar. They used the radar to collect several fish. [13]

After a year of building, he and the Kingdom of Science are able to build the Perseus. Ukyo believes it has a fitting name, due to the circumstances of the world.[14]

Treasure Island Arc

While on route to Treasure Island, the Perseus crew are told by Soyuz of his origins. They note on the possibility of there being other Stone World humans elsewhere. Ukyo was amazed by the possibility but noted this may make the mission complicated because of hostility or the Whyman being there. He then makes comments of the others thoughts on this. [15][16]

Once they reach the island, Ukyo uses the radar to search the area and notes on there being something on the sea floor. When Ginro volunteers and returns, he reveals there are statues down below. When Yo says it is to be expected, Ukyo tells him the inconsistencies of this and wonders how long the statues were there. He is one of the few Perseus members to be petrified, since he and the others were attacked by Kirisame.[17]

However, he managed to hit the device, indirectly allowing Ginro who was off the ship to survive the attack.[18]

He is later restored by Senku and he bears witness to Mozu finding them, being surprised at not hearing him and worried about his intention. However, he is relieved when Gen manipulates the latter into siding with them to take down Ibara, congratulating the mentalist when he is successful.[19]

He aids the others in getting the word of the Head of Petrification Kingdom being a statue out to the others. He is happy Taiju's yelling got the word out.[20]

He heard Ibara's voice about command before they notice Oarashi running in a frenzy and Amaryllis realizes he plans to head to the island's center to petrify everyone. Shocked, Ukyo has Taiju yell to the others on this. After Taiju tackled Oarashi, Ukyo told him to take the weapon but the man had swallowed it and it activates, to Ukyo's horror.[21]

During the battle with Ibara, he is petrified again but not before shouting the device is voice operated.[22]

After Ibara is defeated, he is restored by Senku. When Whyman contacts them, Senku explains that the radius is the entirety of Earth; meaning Whyman is trying to damn humanity all over again. Ukyo points out Whyman is using Senku's voice.[23]

New America City Arc

Ukyo and the others are worried by Whyman having Senku's voice. He soon deduces that the latter is using a synthetic voice.[24]

After the Perseus heads back, Ukyo watches as Tsukasa is revived. Ukyo and the others are rallied by Gen into using war paint to re-adorn their scars until Whyman is defeated.[8]

When Senku explains that Viking sailors reached America 500 years before Columbus. Ukyo and the other crew mates question how the Vikings were able to navigate when the sun was unavailable. He is later excited when they reach America.[25]

After some of the crew were happy to be on land, Ukyo remarks that the crew has had very little meat during the voyage, and Tsukasa notes that the fighters of the crew have been training hard and crave animal protein. Once statues are pointed out to be sitting in the water just off a cape, Senku believes it be the result of a massive car pileup while Ukyo adds on that the cars have corroded away, leaving the drivers behind.[26]

When the group is attacked by an unknown person, they escape on the river. [27]. Ukyo is surprised to hear an engine before he is shocked to witness an aircraft flying above them. Fortunately, Senku has Kirisame bring the plane down using a chemical compound, as the pilot escapes and the plane is salvaged at Senku and Ryusui's urgings.[28]

When the crew gets a call from Chrome and Kohaku, Ukyo watches Senku hang it up because the enemy might track them. Surely enough, the enemy Dr. Xeno makes contact, with Ukyo shocked by this even more so when he requests to speak with Dr. Taiju. Ukyo hears Senku realize that this was a ruse to protect him from harm. He is impressed by Taiju playing the role very well and hears the enemy reveal that they don't have the revival formula. Once Taiju refused Xeno's offer of servitude at the urging of the others, Ukyo heard a noise and was shocked to spot another plane flying above the Perseus. The Perseus crew asks Senku what they should do, as Senku states they’ll battle the enemy in the sky with their new vessels. Ukyo remarks on Senku's tactic, as he announces to the crew that he and Kaseki are building a runway for the Perseus.[29]

Ukyo and his group travel through the forest while wondering about the enemy. [30]

Ukyo and his group soon find Chrome and Kohaku debating on a plan. The group begin to decide on what plan of action should take. However, they soon get a message from the Perseus, with Ukyo telling his shocked allies that Senku was shot.[31]

However, they soon get a message from the Perseus in our shocked when it is revealed that Senku was shot.[32]

After Chrome announces plan to create a drill, the impressed Ukyo and Tsukasa already knew what it was, to his disappointment. [33]

They soon receive a message from the Perseus, with Ukyo translating the Morse code before Ukyo is shocked to hear that one of the members of the American colony, Luna, has started a relationship with Senku.[34]


Senku Ishigami

He was initially an enemy to Senku, due to being Tsukasa's right hand man, but sides with him after learning he and Yuzuriha are repairing the broken petrified humans. Ukyo is often amazed by his efforts. He becomes one of the vital assets for the Kingdom of Science due to his perk of superhuman hearing.

Chapter Appearances

Chapter Appearances
v  d  e
Vs. Hyoga Arc
46. Stone Wars Absent
47. Science Vs. Power Absent
48. Blades of Science Absent
49. To the Present Absent
50. Humanity's Greatest Weapon Pictured
v  d  e
Communications Arc
51. Sweets for the Stone World Absent
52. Age of Energy Absent
53. Hard Knocks Crafting Club Absent
54. Flickering Blue Jewel Absent
55. Treasure Dungeon Push Start Absent
56. The Treasure Absent
57. Heat Hear Absent
58. Wave of Science Absent
59. Voices from Here to Infinity Absent
60. Angel's Song, Devil's Whisper Absent
61. Stone Wars Begin Absent
62. Double Chase Absent
63. Information Warfare Absent
64. Hotline Debut
65. Call From the Dead Appears
66. Liars and Truth Tellers Absent
67. Full Mobilization Appears
68. Flame of Revolution Appears
69. Steam Gorilla Absent
70. Paper Shield Absent
71. Prison Break Fantasy
72. Experience Points Absent
73. Top-Secret Mission Appears
74. Fateful 20 Seconds Appears
75. 20-Second Countdown Pictured
76. Final Battle Appears
77. The Power of Science Appears
78. That Which Destroys or Saves Appears
79. For This Very Moment Appears
80. Humanity's Strongest Tag Team Pictured
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 Absent
86. Money Appears
87. Senku's Department Store Absent
88. Wings of Humanity Pictured
89. Adventures Pictured
90. New World Map Appears
91. Need Bread? Start with Wheat Appears
92. Desire is Noble Appears
93. The First Shot Is Yours Appears
94. The Scent of Black Gold Appears
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 Appears
102. Perseus, Ship of Science Appears
103. Light of Hope and Despair Appears
104. Men of Forensics Absent
105. The Island's Great Beauty Absent
106. The Secret of Petrification Absent
107. To the Trump Card Science Vessel Absent
108. Two Trump Cards Flashback
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 Absent
117. The Kingdom of Science Strikes Back Absent
118. Silent Soldiers Absent
119. Science Soldiers Petrified
120. Top Secret Absent
121. Medusa's True Face Absent
122. Brain-Battle Puzzle Pieces Appears
123. The Battle of Wits' Deal Game Appears
124. The Invention of God and the Devil Appears
125. The Decisive Three-Dimensional Battle Appears
126. A 3-D Strategy Appears
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... Absent
133. Flash of Destruction Appears
134. Commander Faceoff Petrified
135. Counting Absent
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 Appears
142. World Power Appears
143. Ryusui vs. Senku Appears
144. Ryusui & Gen vs. Senku & Kohaku Appears
145. Bar Francois Appears
146. Bar Francois: Bitters Absent
147. Science Journey Appears
148. Pioneers of Earth Appears
149. Light Lure in Darkness Appears
150. Righteous Science User Appears
151. Dr. X Appears
152. Doctor Vs. Doctor Appears
153. Science Wars Appears
154. Spy vs. Spy Appears
155. Science Is Elegant Absent
156. Two Scientists Absent
157. Same Time, Same Place Absent
158. Who's the Scientist? Absent
159. Lock On Absent
160. Gunshots Echo Appears
161. Craft Wars Appears
162. Down the Earth-Stained Path Appears
163. Multifront Final Battle Appears
164. Re-Lock On Absent
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 Appears
v  d  e
South America Arc
170. Staring Up at the Same Moon Appears
171. Staring at the Same Light Absent
172. Marked with an "X" of Wisdom Appears
173. Earth Race Appears
174. The Specter of the Panama Canal Appears
175. Ultra Race Across South America Appears
176. Net-Breaking Battle Plan Appears
177. Medusa Mechanism Appears
178. Science Scales Mountains Appears
179. Bonds on the High-Wire Appears
180. Sickening Yet Beautiful Appears
181. New World Science Appears
182. Diamond Heart Appears


  • Despite being among the Five Wise Generals, Ukyo doesn't have many chances to use his talents.
  • Chapter 75's coloured manga page may depict an earlier version of Ukyo, where he has a petrification scar along his cheekbone and no pants.


  1. 1.0 1.1 Dr. Stone Manga: Chapter 178
  2. Dr. Stone Manga — Vol. 1 Chapter 1, Ukyo Saionji is petrified along with all of Earth's human population.
  3. Dr. Stone Manga — Vol. 6 Chapter 50, Ukyo Saionji first appearance meaning he was revived that year.
  4. Dr. Stone Manga — Chapter 103, Ukyo Saionji is petrified along with majority of the Perseus crew.
  5. Dr. Stone Manga — Chapter 122, Ukyo Saionji is revived along with Yuzuriha and Chrome.
  6. Dr. Stone Manga — Chapter 133, Ukyo Saionji is petrified while chasing Oarashi
  7. Dr. Stone Manga — Vol. 8 Chapter 67, Gen reveals Ukyo's previous occupation to Senku.
  8. 8.0 8.1 Dr. Stone Manga: Chapter 141
  9. Dr. Stone Manga: Chapter 91
  10. Dr. Stone Manga: Chapter 92
  11. Dr. Stone Manga: Chapter 93
  12. Dr. Stone Manga: Chapter 95, Pages 20 - 23
  13. Dr. Stone Manga: Chapter 96
  14. Dr. Stone Manga: Chapter 100
  15. Dr. Stone Manga: Chapter 101
  16. Dr. Stone Manga: Chapter 102
  17. Dr. Stone Manga: Chapter 103
  18. Dr. Stone Manga: Chapter 107
  19. Dr. Stone Manga: Chapter 123
  20. Dr. Stone Manga: Chapter 131
  21. Dr. Stone Manga: Chapter 133
  22. Dr. Stone Manga: Chapter 134
  23. Dr. Stone Manga: Chapter 138
  24. Dr. Stone Manga: Chapter 139
  25. Dr. Stone Manga: Chapter 147
  26. Dr. Stone Manga: Chapter 148
  27. Dr. Stone Manga: Chapter 149
  28. Dr. Stone Manga: Chapter 150
  29. Dr. Stone Manga: Chapter 152
  30. Dr. Stone Manga: Chapter 154
  31. Dr. Stone Manga: Chapter 160
  32. Dr. Stone Manga: Chapter 161
  33. Dr. Stone Manga: Chapter 162
  34. Dr. Stone Manga: Chapter 163

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