Dr. Stone Wiki
Dr. Stone Wiki

Kohaku (コハク) is a young woman who is a descendant of modern humans. She is Ruri's younger sister and the daughter of Kokuyo. She is one of the protagonists of the series.

After meeting Senku and witnessing his bravery, courage and talent, Kohaku invites him to her village. Since Senku assists and fascinates the village with many of his scientific inventions and turned out to be the savior the village ancestors talk about in the stories that are passed down, the population is ultimately rallied to fight and stop Tsukasa's tyrannic empire.[14]

After Taiju, Kohaku is the most loyal to Senku. Since learning about science and the delicate/complicated work it takes to make modern inventions, Kohaku often teams up with Chrome to scavenge ingredients and "persuade" Kinro and Ginro to help with the labor.


Kohaku Icons.png

Kohaku is a young woman of average height with a slim figure. She has a delicate face, blue eyes, and blonde hair tied-up in a spiky ponytail. Her appearance is that of someone who appears to be a mixed heritage of American/Japanese[14], denoting her heritage as the descendant of Byakuya Ishigami and Lillian Weinberg. She shares a resemblance with her older sister, Ruri, but has wild hair in comparison to her sister's soft, flowing hair, and a slimmer body. Her clothing consists of a V-neck, sleeveless and short navy blue dress. Underneath she wears makeshift garments akin to a bra and a fundoshi (traditional Japanese garment). The dress is tied with a rope tied in the middle, and uniquely shaped stone sandals.

While helping Senku gamble against Ryusui and Gen on the trip to America, Kohaku donned a modernized party dress, complete with tights. The dress was long and flowing with slits in the side for her legs' freedom; it had a sparkly pattern with the color fading at the bottom. It lacked sleeves with the top of the dress ending with it being secured behind her neck with a tie.

Later, her shield transitions from her original wooden one to a fully metal one made by Senku.[15]


Kohaku is a kind young woman, caring deeply for her sickly older sister, willing to participate in the tournament for her hand in marriage just to protect her. This care extends to her comrades, and anyone she's loyal to. Other than her sister, she is particularly dedicated to Suika, playing for her the role of an older sister herself. She was willing to lie and take scolding in order not to reveal she was attacked by Tsukasa as not to distress her sister and the villagers.[16]

Despite her great sense of compassion and dedication, or perhaps, in addition to it, she has a choleric and impulsive personality that makes her burst in rage or carry out reckless actions. This in addition to her tomboyish nature is often the object of mockery from people such as Chrome and Senku, calling her names such as "gorilla" or "lioness", leading to a strong reaction and often violence. She was notorious for jumping into conclusions and into action without putting much thought into her decisions, which could potentially lead her into fatal mistakes; however she has improved on this regard, mostly learning from Senku to think twice before action. Illustrating her confidence, she has the habit of starting sentences with a stern 'Hah!' when being assertive.

Kohaku's stance towards people she distrust is completely different to those she does trust. During the early part of the story, she'd always be wary of such people and ready to attack them given just a sliver of a motive. Senku went through this initially with her refusing to let her guard down and sleep with Senku nearby. Likewise was her first impression of Gen, who admitted to being initially a spy for Tsukasa[17], this prompting an actual reaction and threats from her.

She also possesses a strong sense of justice, which in pair with her hotheadedness leads her into dangerous situations such as her battle with a more competent fighter like Tsukasa, whom she decided to attack after witnessing him killing Senku, not being concerned with whichever motives he might've had. [14] Thanks to Senku's numerous scoldings and encouragement to think more than one step ahead, Kohaku grows out of this habit, but her temper is still a problem.

She's repeatedly impressed by Senku's scientific creations, although at first, it took her a while to accept that it's not simply magic.

Kohaku excels at fighting, hunting, and general survival skills. She is a tomboy by nature, having little interest in more typical feminine activities and has little knowledge about them, although she does seem to enjoy some lavish clothing that was provided to her. Kohaku has no problem with being around boys while swimming or changing clothes; she will, however, retaliate if a boy stares lustfully at her breasts. She possesses a sharp instinct and intellect.

Perhaps because of her instinct, Kohaku seems to be a good judge of character.[17] She was able to deduce that Gen was the kind of person who, despite being able to lie without batting an eye and claiming to only work for his self-interest, cherished his loyalty and friendship with Senku. She also recognized that Chrome was in love with Ruri, but hadn't realized his own feelings yet, and was able to read Senku's personality to an extent.

Similar to Senku, she doesn't seem to be greatly interested in romance, previously claiming to have fallen for Senku when she meant that she found him interesting as a person. She will however tease people she's comfortable with, such as offering herself to Chrome as a substitute for her sister early on, or offering a hug to Gen when he attempted to lure Amaryllis into doing so, without success.

Despite all, she does seem to foster some degree of feelings for Senku, at least after knowing him for longer. She is known to loathe men who are selfish or shallow, such as how Gen appeared early on. Later she would state that she likes "Men, who for what they believe in, will keep putting one foot in front of the other, for all eternity, chipping away at progress"[18] or to put it short, a description of her impression of Senku. They also have other moments such as her hugging him upon reuniting, or admitting that she finds him attractive. regardless of how deep these feelings may be, she is pragmatic enough to not act on them for the moment, preferring to do what she can to further the restoration of humanity and the defeat of Why-Man.

Abilities and Skills

Kohaku's swift strikes.

  • Enhanced Physical Prowess: Kohaku appears to be well known in her village due to her combative abilities, as both Kinro and Ginro were afraid of her.[19] Tsukasa, a world-class fighter, stated that she would have been famous for her fighting abilities back in the Pre-Petrification world[14]. Kohaku possesses great strength and endurance, credited by Chrome to be one of the few superhumanly strong individuals within the village, being able to carry a heavy pot filled with hot water on a daily basis for her sickly older sister, Ruri. In an extra, Kohaku rates herself with 1000 battle points, Kinro having 500 and Ginro having 100 respectively.[20] Despite her skill, she is inferior to Tsukasa Shishio, Hyoga, and Moz; Tsukasa had proper marital art training, Hyoga is a spear expert and Moz is simply better-muscled. She does however seem to perfectly match Kirisame in fighting skills.
  • Enhanced Strength: She is tasked with carrying a heavy pot filled with hot water over long distances on a daily basis for her sickly sister Ruri, Senku noting it's just shy of 50 kilograms (which is around 110 pounds).[19] When Senku tries to lift the pot in order to help Kohaku, he quickly succumbs to its weight; granted Senku is incredibly weak in comparison, but for anyone to carry 50 kilograms a long distance without tiring is amazing feat.
  • Enhanced Speed: Her more notable traits are her speed and agility, which makes her highly proficient in close-quarters combat. When fighting, she attacks with a flurry of blades and kicks. She also possesses quick reflexes, as she was able to easily stop an attack from Kinro and Ginro when they both attacked her. Because of her speed, the two of them fear her wrath. Naturally she also excels when it comes to plain running, only being matched by Homura in this regard. Aboard the new Perseus, she observed that the ship seemed to be on par with her top speed on land, according to herself.[21] The ship had been previously stated to have a top speed of 20 knots[22], or 37 kilometers per hour.
  • Enhanced Senses: In addition to all this, Kohaku is gifted with incredible eyesight. She first noticed something is off about the North Star not being true north[23], being able to spot Tsukasa and Senku from afar, and finding oil from just a crude aerial photo taken from a hot air balloon. However, she was unable to sense Kirisame in their first fight. Matsukaze even blitzed right through her, without her noticing.
  • Hunting: Kohaku is an accomplished hunter. She caught a wild boar for Francois with ease when they were looking to capture some for their farm. She's one of the most reliable people when it comes to hunting. Additionally, her extraordinary eyesight helps in all these endeavors.
  • Instinct: Perhaps because of her experience in hunting, Kohaku possesses a sharp instinct, able to discern information and situations correctly.
  • Intelligence: While not as smart as Chrome or skilled as Kaseki, she proves to be quick on the uptake in an understanding of some of the science Senku demonstrates, and the complex strategies they use in their endeavors, like her covert acts to send Senku supplies and critical information despite the lack of 2-way communication and her illiteracy. She also used a coded word to get her allies' attention, during an enemy attack.[24] When Ginro was severely wounded, she realized that in order to save him, she would have to petrify him and did so by threatening to reveal Ibara's secret.


Kohaku wields two primitive-looking knives and an orange-colored buckler, the shield her father gifted her as a child. Later, she discards her dual knives in favor of the katana that Kaseki and Senku forged for her and the other warriors.[25] After her shield is repurposed a gear, it is replaced with a metallic one.

While infiltrated at Treasure Island, she was instead equipped with a wireless earpiece (a crystal radio made to look like an earring) and a bladed weapon concealed in the form of a thigh strap.

After being depetrified for the second time, she goes back to using duel wield knives with her shield attached to her back.


3/5 C
5/5 A
3/5 C
2/5 D
Kohaku's stats, according to Volume 6

Chapter Appearances

Chapter Appearances
Vs. Tsukasa Arc
5. Yuzuriha Absent
6. Taiju vs. Tsukasa Absent
7. The Gunpowder Adventure Absent
8. Raise The Smoke Signal Absent
9. Senku vs. Tsukasa Debut
10. Student of Science Absent
11. Weapon of Science Absent
12. Epilogue of Prologue (End of Part 0) Absent
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 Shadow
16. Kohaku Appears
17. Nasty Looks Appears
18. Sorcery Showdown Appears
19. Two Million Years of Being Appears
20. Stone Road Appears
21. Dawn of Iron Appears
22. Survival Gourmet Appears
23. The Smooth Talker Appears
24. Lightning Speed!!! Appears
25. By These Hands, the Light of Science Appears
26. A Shadow Alliance Appears
27. A Certain Scientists Wish Appears
28. Clear World Appears
29. Senku's Lab Appears
30. Death Green Appears
31. Friends Have Each Other's Backs Appears
32. Brain & Heart Pictured
33. Baaad Chemicals Appears
Village Games Arc
34. Sneaky Grand Bout Strategy Appears
35. The Masked Warrior Pictured
36. Kinro and Ginro Appears
37. Science-User Chrome Appears
38. Master of Flame Pictured
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 Appears
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 Appears
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
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 Appears
56. The Treasure Appears
57. Heat Heart 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 Appears
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 Appears
75. 20-Second Countdown Appears
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 Appears
81. Fingertip Absent
82. Epilogue of Stone Wars (End of Part 2) Appears
Age of Exploration Arc
83. Dr. Stone Appears
84. People = Power Appears
85. Ultimate Resource Appears
86. Money Appears
87. Senku's Department Store Absent
88. Wings of Humanity Pictured
89. Adventures Appears
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 Pictured
99. Kingdom of Science Photo Journal Appears
100. Origin of the 100 Tales Appears
Treasure Island Arc
101. Treasure Chest Appears
102. Perseus, Ship of Science Appears
103. Light of Hope and Despair Appears
104. Men of Forensics Appears
105. The Island's Great Beauty Appears
106. The Secret of Petrification Appears
107. To the Trump Card Science Vessel Appears
108. Two Trump Cards Appears
109. The Great Escape Appears
110. Beautiful Science Appears
111. Science Wars Appears
112. King of Three Dimensions Appears
113. Cryptography Science Appears
114. Silently, Science Pierces the Stone Appears
115. One Second, One Grain Appears
116. Miracle in Hand Appears
117. The Kingdom of Science Strikes Back Fantasy
118. Silent Soldiers Absent
119. Science Soldiers Appears
120. Top Secret Appears
121. Medusa's True Face Appears
122. Brain-Battle Puzzle Pieces Petrified
123. The Battle of Wits' Deal Game Absent
124. The Invention of God and the Devil Absent
125. The Decisive Three-Dimensional Battle Petrified
126. A 3-D Strategy Petrified
127. Medusa and Perseus Petrified
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 Appears
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 Appears
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 Mentioned
154. Spy vs. Spy Pictured
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 Appears
168. Corn City: Population One Million Appears
169. RISK or HEART Pictured
South America Arc
170. Staring Up at the Same Moon Appears
171. Staring at the Same Light Appears
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
183. Stone Sanctuary Appears
184. Fort Medusa Appears
185. Lovely Cleavage Plane Appears
186. To Each Their Own Blade Appears
187. Cyber Guerilla Appears
188. What I Once Sought to Destroy Appears
189. Our Dr. Stone Appears
190. Science Transcends Life Mentioned
191. Divine Scream, Down to Earth Absent
192. Until We Meet Again Absent
193. Our Stone World Absent
New Stone World Arc
194. Homo Sapiens, All Alone Petrified
195. Treasure Hunter, All Alone Petrified
196. Scientist, All Alone Petrified
197. A Stony Eden and Its Forbidden Fruit Appears
198. Whole New World Fantasy
199. Superalloys Appears
200. Future Engine Appears
Globetrotting Arc
201. Morse Talk Appears
202. Ryusui Corp. Appears
203. Missile Heart Appears
204. The Universe is Written in the Language of Mathematics Appears
205. Universe of Zeroes and Ones Appears
206. Dawn of the Computer Appears
207. Linking the Circuit Diagram Appears
208. Science Transcends Humanity Appears
209. The Rocket's Hard Truth Appears
210. Not One-Way Appears
211. World Tour for Resources Appears
212. Final Part: Stone to Space Appears
Moon Mission Arc
213. Unknown Known Appears
214. Stone World's Earth Defense Force Appears
215. Long, Long Road Appears
216. Hello, World Appears
217. Science Underdogs Appears
218. WWW (World Wide Workshop) Appears
219. Three Heroes Appears
220. A Desire for All Appears
221. Entrusting It All Appears
222. Science Road Appears
223. 0 Appears
224. In Space Appears
225. Docking Appears
226. Giant Step Appears
227. It Was You Appears
228. Life Stone Appears
229. Why-Man Pictured
230. Human Appears
231. A Future To Get Excited About Appears
232. Final Chapter: Dr. STONE Appears


  • Her name is the Japanese word for amber, which is fossilized tree resin.
  • In the cover of Chapter 17, her eyes were mistakenly shown as yellow/brown, even though it was stated that she has blue eyes. This mistake was later fixed with the cover of Chapter 22.
  • Kohaku ranked 2nd in the 1st Character Popularity Poll.
    • She was close to rivaling with Gen, who ranked third place.
  • She is the first girl to kiss Senku.[26]
  • Kohaku only hits Chrome (and occasionally Ginro) for calling her a gorilla, even when Senku does the same.
    • Senku did however get a roughening from her in the side story accompanying Chapter 18.
  • After the second global petrification, Suika remade Kohaku's shoes with knots like hers, since she is her best friend.[27]
  • She was originally two years younger than her older sister but after the second petrification event, the pair are now the same age.


  1. Dr. Stone Manga: Volume 22 — Extras
  2. Dr. Stone Manga: Volume 4 — Q&A
  3. Dr. Stone Manga: Chapter 212
  4. 4.0 4.1 Dr. Stone Manga: Chapter 178, Page 18
  5. Dr. Stone Manga: Volume 19 — Extras
  6. Dr. Stone Manga: Chapter 121, Page 19, Kohaku is petrified along with Ginro.
  7. Dr. Stone Manga: Chapter 138, Page 10
  8. Dr. Stone Manga: Chapter 192, Page 21, Kohaku is petrified along with the rest of the world.
  9. Dr. Stone Manga: Chapter 197, Page 4, Kohaku is revived by Suika.
  10. Dr. Stone Manga: Chapter 223, Page 12
  11. Dr. Stone Manga: Chapter 224, Page 13
  12. Dr. Stone Manga: Chapter 226, Page 4
  13. Dr. Stone Manga: Chapter 226, Page 7
  14. 14.0 14.1 14.2 14.3 Dr. Stone Manga: Chapter 16
  15. https://www.youtube.com/watch?v=1goTZiKOk_g [Boichi, PLZ draw this!] A Queen and beauty, KOHAKU AND AMARYLLIS!
  16. Dr. Stone Manga: Chapter 19
  17. 17.0 17.1 Dr. Stone Manga: Chapter 23
  18. Dr. Stone Manga: Chapter 121, Page 4
  19. 19.0 19.1 Dr. Stone Manga: Chapter 18
  20. Dr. Stone Manga: Chapter 22
  21. Dr. Stone Manga: Chapter 201, Page 3
  22. Dr. Stone Manga: Chapter 200, Page 16
  23. Dr. Stone Manga: Chapter 20, Page 13
  24. Dr. Stone Manga: Chapter 107, Page 14
  25. Dr. Stone Manga: Chapter 48, Page 5
  26. Dr. Stone Manga: Chapter 107, Page 17
  27. https://www.youtube.com/watch?v=EZQLCsjJDsI [Boichi, PLZ draw this!] Sai and Ryusui Brother and kid and youth Suika

Site Navigation

v  e
Ishigami Villagers
Male AlabasterArgoCarboChromeGanenGenbuGinroHaganeJasperKasekiKinroKokuyoMagmaMantleNatriSaganShoSoyuzTetsukenTitanUnmo
Female AlumiAzuraBerylDiaEnGarnetKohakuKujakuNamariRubyRuriSangoSapphireShiroganeShovelSuikaSuzuTurquoise
Unknown ChalkSagara
v  e
Kingdom of Science
Male ChromeGen AsagiriGinroHyogaJoel GearKasekiKinroKokuyoMagmaMatsukazeMozRyusui NanamiSai NanamiSenku IshigamiTaiju OkiTetsuya KinomotoTsukasa ShishioUkyo SaionjiYo Uei
Female Chelsea ChildeHomura MomijiKirisameKohakuMinami HokutozaiMirai ShishioNikki HanadaRuriSuikaYuzuriha Ogawa
Unknown FrancoisAmerican ColonyIshigami Village
v  e
Post-Petrification Humans
Ishigami Villagers
Petrification Kingdom
Soyuz's fatherIbaraMatsukazeMozOarashiSoyuz