Kokuyo

"Rocks this heavy are sure to do some damage!"

— Kokuyo, Dr. Stone (Manga), Chapter 57

Kokuyo (コクヨウ, Kokuyō) is the father of Kohaku and Ruri, and was the previous chief^[6] of Ishigami Village before Senku.

Despite not being the chief anymore, he serves as something of a co-leader of Ishigami Village, focusing on more practical concerns like food gathering, while Senku focuses on scientific advancement.

Appearance

Kokuyo is a large, muscular middle-aged man with blond hair tied into a ponytail. He has gruff, hardened facial features with thick eyebrows, a large nose, and intense brown eyes. His long brown beard and goatee notably do not match his blond hair, and for clothes, he wears a blue robe with a white undercloth with a rope tied around his neck.

Personality

Initially, he is a harsh man who threatens to disown Kohaku as his daughter for constantly going against him, such as entering the village tournament and winning to prevent Magma from becoming the new chief and marrying Ruri or bringing an unknown figure to the village.^[7] He also didn't seem to mind Magma being the new chief, despite knowing that he didn't care for Ruri's well-being. However, he does care for Ruri, as he worries for her health. He seems to want to become closer to his daughters and becomes saddened when they don't reciprocate. For example, he gave Kohaku her shield, and when Senku suggested using it in one of his inventions, he shyly remarks that he is fine with it as long as Kohaku is, but clearly expects her to reject it. He is saddened when she shows no sentiment towards the shield and quickly uses it in the invention. He seems to later reconcile with Kohaku, as he realizes how hard she worked carrying water for her sister every day to delay her illness.

He is wary of outsiders, especially Senku^[7][6], but later grows to accept him and states that making him the leader was not a mistake.

He can be simpleminded, believing the tungsten that Senku brought was for throwing at enemies and not realizing that he was going to use it for an experiment. Ruri and Kohaku claim this is because he came from the older generation. Despite his practical and initially simple view of the world, he develops an appreciation for the comforts that the Kingdom of Science has brought to his village and its people. He praises Senku for not only being an effective leader and worthy successor but also for being someone who has brought out a crucial element for survival: fun.

Abilities and Skills

• Physical Strength: Kokuyo is one of the primary fighters of Ishigami Village. It can be said he is the strongest of his time, as he was the winner of his Grand Bout^[8]. He is often seen leading an attack among the strongest villagers, such as Kohaku and Magma.

• Swordsmanship: Kokuyo is seen using a katana to defend the village when Hyoga attacks them^[9], and when he assisted in attacking the miracle cave.

• Leadership: Being the chief of Ishigami Village for many years, he has become a strong leader, often thinking of the villagers safety. He is upset when the village rules are broken, even disowning his own daughter, Kohaku, for breaking said rules. When Homura was coming towards the village, Kokuyo immediately ordered seniors and children to take shelter, and told everyone else to surround her^[10], and despite him no longer being chief, they do as he says anyways, showing the respect the village has for him as a leader.

History

He won one of the previous village games and became chief. In commemoration of his victory, Kaseki made a shield for him. Some years later, he would pass the shield on to Kohaku. Ruri was stricken with pneumonia at some point in the past, and he began to make plans for Kohaku to learn the Hundred Tales and succeed Ruri as priestess in the event of her death. Kohaku refused to go along with this plan, creating a rift between Kokuyo and Kohaku that would continue into the present.^[11]

Plot

Kingdom of Science Arc

With Senku's arrival in the village, Kohaku's disobedience appalls Kokuyo. Angered, he says he might eventually disown her given how she constantly breaks village's rules.^[7]

After Senku, Chrome, Kohaku, and Suika make ramen and goad some villagers into trying it, Kokuyo is becoming more concerned for the village. Jasper asks Kokuyo whether or not they should go out to eat themselves, which Kokuyo rebukes. His wife elbows the former for making such a suggestion, as Ruri gets worried about what Kohaku's business with an unknown figure is.^[6]

Village Games Arc

Kokuyo compliments the weather on the day of the tournament and asks Turquoise whether the preparations are set. When Turquoise berates her husband for allowing Kohaku into the fight, Kokuyo states that it's fine; he wouldn't let a village chief be someone who can't beat a woman. Jasper then informs Kokuyo that Senku has also joined the village games.^[12]

When Ruri approaches Senku to inquire him about his surname, she collapses from her ailment. Kokuyo rushes towards his daughter, scolding Jasper for letting her walk while feeling sick.^[13]

He comments on Senku's cunning nature as the latter uses an unorthodox technique with his spear to hit Ginro in the groin.^[14] Soon after, Senku wins by Chrome getting disqualified from fainting and becomes the village chief. An angry Kokuyo states that he won't accept an outsider like Senku as the village chief, which Senku rebukes, calling him a former village chief and saying he has no interest in what a former figure of authority has to say. Once Senku acquires alcohol for the antibiotic formula, he immediately divorces Ruri and drags Kohaku and Kaseki away with him, further shocking the former village chief, who orders him to get Senku, but Kinro stops him, who vouches for the mysterious scientist. Once the cure is finished, an uneasy Kokuyo observes Ruri taking a suspicious drug for her illness.^[15]

Once Ruri's condition worsens, Kokuyo blames Senku who fed the drugs to her beforehand. Senku confirms this, however he states that the reason behind the more critical condition is because bacteria in question is mobilizing forces as its existence is threatened. Kokuyo goes on to call it sorcery, still angry and attempting to attack him. His attack is stopped by Kohaku who states she believes in Senku, while the rest of the group also nods in unison. After continuous consumption of the drug, Ruri is finally able to walk normally again, having been cured of the ailment. Kokuyo and his other daughter cry tears of happiness, seeing their relative finally well again. The former chief officially crowns Senku the new leader of the Ishigami Village.^[16]

Vs. Hyoga Arc

He stops Kohaku from getting involved in the battle with Kinro and Hyoga, saying that she would have no chance fighting a spear wielder on a thin bridge.^[17]

Kokuyo later defends the village from Hyoga and his men with the katanas that Senku, Chrome, and Kaseki make.^[18] Hyoga, whose spear breaks upon exerting too much force, quickly dispatches Kokuyo and the rest of the warriors, thanks to Gen tampering with it prior to the second invasion.^[19]

Kokuyo attempts to fight Homura after she sets the village on fire, but she escapes. He leads the evac efforts for the village as it burns down. Kokuyo later congratulates Suika on leading the enemy away and celebrates with the village their win over the first battle in the war.^[20]

Communications Arc

Once the cotton candy machine is crafted as a part of the cellphone-making process, Kokuyo enjoys the taste of the sweet along with the rest of the villagers.^[21]

While discussing the problem of manpower in preparation of the cellphone, Kokuyo mentions that a portion of people needs to be delegated to prepare the village for the winter. As Senku produces an idea of utilizing gears to ease the burden on the working force, Kokuyo is shocked to see that Kohaku readily gives up her shield, which he gave her as a memento of the past to be used as a gear itself.^[8]

Kokuyo is amazed by a method to preserve meat over winter by bottling the food in a glass pots.^[22] The village leader announces the sunrise of a new year, and is bewildered by the properties of tungsten, a material needed for Kingdom of Science's progress.^[23] Once acquiring various types of jewels, a satisfied Kokuyo states that they will be useful in defending the village, comically misunderstanding what they're designed for.^[24]

He is later seen when Senku plays the record his father left him, being amazed to hear the village founder. Kokuyo sadly remarks to himself that Kohaku is even more of a distant child after she calls Senku's treatment of his father cold.^[25]

Treasure Island Arc

He travels on the Perseus to gather a way of creating more revival formula.

During the voyage, he is upset at the possibility of the Why-man being on the new island. He complains to Soyuz after he reveals the truth about himself and his past. However, he relents after realizing how hard it was for him.^[26]

He is shocked to discover Suika stow away after Ryusui discovers her hiding.^[27]

Kirisame petrifies him, but Senku revives him.

Kokuyo is petrified once again because of Ibara's last resort.

New America City Arc

Kokuyo bears witness to the training of his daughter and Kirisame, remarking on their skill.^[28]

Kokuyo returns to Ishigami Village while his allies journey to America.

South America Arc

He witnesses the Petrification beam heading over the horizon, and knowing its meaning, he tells his fellows to assume a defensive position so they will not be damaged while stoned. He is then petrified with the villagers.^[29]

Globetrotting Arc

Nine years after petrifying, the returning members of the Kingdom of Science revived Kokuyo and the others. He is elated by the return of Kohaku and her friends. He and Ruri soon explain that they and the others did not create the wall, which protected the petrified villagers, before it is revealed that Sagara and Chalk made it.^[30]

Chapter Appearances

Chapter Appearances
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 Appears 24. Lightning Speed!!! Absent 25. By These Hands, the Light of Science Absent 26. A Shadow Alliance Absent 27. A Certain Scientists Wish Appears 28. Clear World Absent 29. Senku's Lab Flashback 30. Death Green Absent 31. Friends Have Each Other's Backs Flashback 32. Brain & Heart Absent 33. Baaad Chemicals Appears
Village Games Arc 34. Sneaky Grand Bout Strategy Appears 35. The Masked Warrior Appears 36. Kinro and Ginro Appears 37. Science-User Chrome Absent 38. Master of Flame Absent 39. And the Winner is... Appears 40. Two Million Years in the Making Appears
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
Vs. Hyoga Arc 46. Stone Wars Pictured 47. Science Vs. Power Pictured 48. Blades of Science Pictured 49. To the Present Appears 50. Humanity's Greatest Weapon Absent
Communications Arc 51. Sweets for the Stone World Appears 52. Age of Energy Appears 53. Hard Knocks Crafting Club Appears 54. Flickering Blue Jewel Pictured 55. Treasure Dungeon Push Start Absent 56. The Treasure Pictured 57. Heat Heart Appears 58. Wave of Science Appears 59. Voices from Here to Infinity Absent 60. Angel's Song, Devil's Whisper Appears 61. Stone Wars Begin Appears 62. Double Chase Appears 63. Information Warfare Absent 64. Hotline Absent 65. Call From the Dead Appears 66. Liars and Truth Tellers Absent 67. Full Mobilization Appears 68. Flame of Revolution Absent 69. Steam Gorilla Appears 70. Paper Shield Appears 71. Prison Break Absent 72. Experience Points Absent 73. Top-Secret Mission Pictured 74. Fateful 20 Seconds Pictured 75. 20-Second Countdown Pictured 76. Final Battle Pictured 77. The Power of Science Appears 78. That Which Destroys or Saves Absent 79. For This Very Moment Absent 80. Humanity's Strongest Tag Team Pictured 81. Fingertip Absent 82. Epilogue of Stone Wars (End of Part 2) Absent
Age of Exploration Arc 83. Dr. Stone Appears 84. People = Power Appears 85. Ultimate Resource Absent 86. Money Absent 87. Senku's Department Store Absent 88. Wings of Humanity Absent 89. Adventures Absent 90. New World Map Absent 91. Need Bread? Start with Wheat Absent 92. Desire is Noble Absent 93. The First Shot Is Yours Absent 94. The Scent of Black Gold Absent 95. First Contact Absent 96. Eye of Science Absent 97. The Joy of Leadership Absent 98. Ryusui Appears 99. Kingdom of Science Photo Journal Absent 100. Origin of the 100 Tales Pictured
Treasure Island Arc 101. Treasure Chest Appears 102. Perseus, Ship of Science Absent 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 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 Absent 117. The Kingdom of Science Strikes Back Absent 118. Silent Soldiers Absent 119. Science Soldiers Absent 120. Top Secret Absent 121. Medusa's True Face Absent 122. Brain-Battle Puzzle Pieces Absent 123. The Battle of Wits' Deal Game Absent 124. The Invention of God and the Devil Absent 125. The Decisive Three-Dimensional Battle Absent 126. A 3-D Strategy Absent 127. Medusa and Perseus Absent 128. Island-Wide Battle Royale Absent 129. Joker Absent 130. Devil's Choice Absent 131. Nasty Crimes Absent 132. The Strongest Weapon Is... Absent 133. Flash of Destruction Absent 134. Commander Faceoff Absent 135. Counting Absent 136. Medusa Vs. Science Absent 137. Last Man Standing Absent 138. End Of Part 3 Absent
New America City Arc 139. First Dream Appears 140. New World Plots Absent 141. First Team Absent 142. World Power Absent 143. Ryusui vs. Senku Absent 144. Ryusui & Gen vs. Senku & Kohaku Absent 145. Bar Francois Absent 146. Bar Francois: Bitters Absent 147. Science Journey Absent 148. Pioneers of Earth Absent 149. Light Lure in Darkness Absent 150. Righteous Science User Absent 151. Dr. X Absent 152. Doctor Vs. Doctor Absent 153. Science Wars Absent 154. Spy vs. Spy Absent 155. Science Is Elegant Pictured 156. Two Scientists Absent 157. Same Time, Same Place Absent 158. Who's the Scientist? Absent 159. Lock On Absent 160. Gunshots Echo Absent 161. Craft Wars Absent 162. Down the Earth-Stained Path Absent 163. Multifront Final Battle Absent 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 Absent 169. RISK or HEART Absent
South America Arc 170. Staring Up at the Same Moon Absent 171. Staring at the Same Light Absent 172. Marked with an "X" of Wisdom Absent 173. Earth Race Absent 174. The Specter of the Panama Canal Absent 175. Ultra Race Across South America Absent 176. Net-Breaking Battle Plan Absent 177. Medusa Mechanism Absent 178. Science Scales Mountains Absent 179. Bonds on the High-Wire Absent 180. Sickening Yet Beautiful Absent 181. New World Science Absent 182. Diamond Heart Absent 183. Stone Sanctuary Absent 184. Fort Medusa Absent 185. Lovely Cleavage Plane Absent 186. To Each Their Own Blade Absent 187. Cyber Guerilla Absent 188. What I Once Sought to Destroy Absent 189. Our Dr. Stone Absent 190. Science Transcends Life Absent 191. Divine Scream, Down to Earth Absent 192. Until We Meet Again Absent 193. Our Stone World Appears
New Stone World Arc 194. Homo Sapiens, All Alone Petrified 195. Treasure Hunter, All Alone Absent 196. Scientist, All Alone Absent 197. A Stony Eden and Its Forbidden Fruit Absent 198. Whole New World Absent 199. Superalloys Absent 200. Future Engine Absent
Globetrotting Arc 201. Morse Talk Absent 202. Ryusui Corp. Absent 203. Missile Heart Absent 204. The Universe is Written in the Language of Mathematics Absent 205. Universe of Zeroes and Ones Absent 206. Dawn of the Computer Absent 207. Linking the Circuit Diagram Absent 208. Science Transcends Humanity Absent 209. The Rocket's Hard Truth Absent 210. Not One-Way Absent 211. World Tour for Resources Petrified 212. Final Part: Stone to Space Appears
Moon Mission Arc 213. Unknown Known Absent 214. Stone World's Earth Defense Force Pictured 215. Long, Long Road Absent 216. Hello, World Absent 217. Science Underdogs Absent 218. WWW (World Wide Workshop) Absent 219. Three Heroes Absent 220. A Desire for All Absent 221. Entrusting It All Absent 222. Science Road Absent 223. 0 Pictured 224. In Space Absent 225. Docking Absent 226. Giant Step Absent 227. It Was You Absent 228. Life Stone Absent 229. Why-Man Absent 230. Human Absent 231. A Future To Get Excited About Absent 232. Final Chapter: Dr. STONE Pictured

Trivia

• His name is derived from the Japanese word for obsidian (黒 (こく) 曜 (よう) 石 (せき) , obsidian) made up of the characters Black (黒, Kuro) and Jewel (曜石, Youseki).

References

Site Navigation

v • eIshigami Villagers
Male	Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Soyuz • Tetsuken • Titan • Unmo
Female	Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise
Unknown	Chalk • Sagara

v • eKingdom of Science
Male	Chrome • Gen Asagiri • Ginro • Hyoga • Joel Gear • Kaseki • Kinro • Kokuyo • Magma • Ryusui Nanami • Sai Nanami • Senku Ishigami • Taiju Oki • Tetsuya Kinomoto • Tsukasa Shishio • Ukyo Saionji • Yo Uei
Female	Chelsea Childe • Homura Momiji • Kohaku • Minami Hokutozai • Mirai Shishio • Nikki Hanada • Ruri • Suika • Yuzuriha Ogawa
Unknown	Francois
Affiliated Groups	American Colony • Ishigami Villagers • Petrification Kingdom

v • ePost-Petrification Humans
Ishigami Villagers	Male	Alabaster • Argo • Carbo • Chrome • Ganen • Genbu • Ginro • Hagane • Jasper • Kaseki • Kinro • Kokuyo • Magma • Mantle • Natri • Sagan • Sho • Tetsuken • Titan • Unmo
	Female	Alumi • Azura • Beryl • Dia • En • Garnet • Kohaku • Kujaku • Namari • Ruby • Ruri • Sango • Sapphire • Shirogane • Shovel • Suika • Suzu • Turquoise
Petrification Kingdom	Male	Soyuz's father • Ibara • Matsukaze • Moz • Oarashi • Soyuz
	Female	Amaryllis • Kirisame