Kohaku

Biodata

Power Progression

Kohaku’s documented advancement comes through martial arts training rather than named cultivation realms or numerical levels.

Background / History

Kohaku belongs to Ishigami Village, whose inhabitants descend from the astronauts who survived humanity’s petrification. Chen Yu identifies her and Ruri as descendants who resemble Lillian 39.

As a child, she fought other people and later hunted, sometimes finding unexpected reserves of strength that Chen Yu subsequently explains as an adrenaline response. Her hunting experience also gives her a strong foundation for martial arts training 13 33.

Ruri’s illness becomes a central responsibility in Kohaku’s life. She carries hot spring water up and down the mountain daily and seeks treatment for her sister. Her relationship with Kokuyo has been strained since childhood; he also dissuaded her from exploring the Forbidden Zone, initially through warnings and then by frightening her away from it 11 18 43.

Appearance

Kohaku is a blonde girl with her hair tied back, wearing clothing suited to the primitive world 9.

• Back-carried equipment: A short-blade hilt is visible on her back, and she frequently carries a shield there 31 50.
• Family resemblance: Chen Yu remarks that both Kohaku and Ruri resemble Lillian 39.

Personality

Kohaku is fiercely protective of her sister and village. During her first encounter with Chen Yu, she prepares to defend Ruri’s hot spring water before gradually lowering her guard as he explains medicinal herbs. She is much harsher toward suspected enemies: she threatens Gen during questioning and asks whether potentially dangerous outsiders should be killed 9 12 14 30.

She is competitive, persistent, and eager to learn. Defeat by Chen Yu does not discourage her; she repeatedly requests sparring and instruction. Although irritated by Ginro’s taunting during horse-stance practice, she controls herself rather than disobeying her teacher’s instructions 13 30 31.

Her bluntness extends to friends. She slaps Senku for comparing her to a gorilla and rebukes his insensitive remark about Ruri’s improved appearance. Conversely, she openly displays relief and affection, bursting into tears when the medicine for her sister is finally completed 11 37 38.

Abilities & Skills

Physical Strength and Endurance

• Carries a large container of hot spring water up and down the mountain every day without considering it tiring; Senku collapses when he attempts to carry it 11.
• Forcefully operates the ironworks bellows, helping increase the furnace’s output 14.
• Continues sparring through repeated falls and painful blows, though Chen Yu’s later training leaves both her and Kinro exhausted 30 47.

Speed, Agility, and Close Combat

• Charges fast enough to astonish Gen during her first match with Chen Yu 13.
• Uses short blades and specializes in close-range fighting; Chen Yu selects punching and kicking techniques to suit her strengths 31 50.
• Uses Ginro’s back as a platform to launch an aerial attack against Hyoga 45.
• Limit: Chen Yu’s Tai Chi neutralizes her force and prevents her from landing effective attacks during their match 13.
• Equipment constraint: Chen Yu believes a full suit of armor would hinder her agility and prevent her from making full use of her strength 50.

Eyesight and Threat Recognition

• Chen Yu remembers her as possessing exceptionally sharp eyesight, able to observe events hundreds of meters away and distinguish black, gray, and white 8.
• Recognizes Chen Yu’s strength during their first meeting despite his ordinary appearance, noting his ability to move between branches 9.
• Coordinates with Kinro and Ginro to surround Gen when Senku confirms that the stranger is not his friend 12.

Martial Arts Training

• Develops a stable horse stance through sustained practice under Chen Yu 31 33.
• Gains experience against Tube Spear Style before confronting Hyoga, which she credits with preventing a more serious outcome in their battle 30 45.
• Receives instruction suited to close-quarters combat rather than Chen Yu’s swordsmanship or bottle-throwing technique, both of which he considers unsuitable for her 31 33.
• Remains below Hyoga in their encounter: she can exchange a few moves with him, but the village fighters cannot defeat him through straightforward attacks 45.

Practical Knowledge

• Recognizes some medicinal herbs and carefully memorizes Chen Yu’s preparation instructions for Ruri 9.
• Prepares the herbs successfully enough to earn Chen Yu’s approval 14.
• Recognizes poisonous gelsemium from childhood warnings and immediately tries to pull Chen Yu away from it 33.
• Helps Chen Yu and Kaseki make seven iron needles and two silver needles 29.

Equipment / Weapons / Items

• Wooden sword — Used in her first formal match against Chen Yu 13.
• Short blades — Identified by Chen Yu as her usual weapon type 31.
• Sturdy shield — Made by Kaseki and often carried on her back 26 50.
• Hot spring water container — Carried daily for Ruri’s care 9 11.
• Medicinal herbs — Supplied by Chen Yu and prepared according to his instructions 9 14.
• Proposed protective gear — Chen Yu considers knee guards and flexible light protection for her; the provided account does not confirm their completion 50.

Relationships

• Ruri — Older sister. Kohaku carries water, prepares herbs, and assists the effort to obtain the medicine that restores her health 9 14 37 38.
• Kokuyo — Father and former village chief. Their relationship has been difficult since childhood; Kohaku nevertheless gives him a factual account of Magma’s attack during Chen Yu’s compensation demand 18 37.
• Chen Yu — Ruri’s herbal doctor, sparring partner, and martial arts teacher. Kohaku’s initial suspicion turns into enthusiasm for his instruction; she also tries to protect him from poisonous gelsemium 9 13 31 33.
• Senku — Friend and scientific ally. She supports his medicine-making and village defense efforts while freely criticizing his manners 18 37 38 45.
• Kinro — Fellow defender and training partner. They coordinate against Gen and Hyoga and later spar under Chen Yu’s supervision 12 45 47.
• Ginro — Fellow village guard. His taunts test her discipline during training, and she rescues him when he approaches a dangerous lake 31 32.
• Gen Asagiri — Initially treated as a suspected enemy and untrustworthy opportunist; later participates alongside her in the defense against Hyoga 12 15 17 45.
• Magma — Initially regarded as dangerous and unreasonable. After his reform, she joins the others in encouraging him not to withdraw from the Grand Bout 15 36.
• Hyoga — Enemy combatant whose spear style becomes a focus of her preparation. She fights him alongside Kinro and Magma 30 45.

Story Role / Major Arcs

Meeting Chen Yu and Securing Treatment

• Intercepts Chen Yu in the forest while carrying water for Ruri. He provides herbs and preparation instructions despite not knowing the exact illness 9.
• Receives Senku’s assurance that Chen Yu is a skilled doctor and follows the prescription 11.
• Recognizes Chen Yu when he arrives with Gen, distinguishing the doctor from the suspected enemy 12.
• Challenges him to a public match and admits defeat after exhausting herself against his Tai Chi 13.

Village Disputes and Training

• Keeps watch beside the immobilized Magma overnight, then confirms what she witnessed when Kokuyo questions Chen Yu’s accusation 18.
• Begins repeated sparring and foundational martial arts training 30 31.
• Pulls Ginro away from the dangerous lake after Chen Yu’s warning 32.
• Attempts to stop Chen Yu from collecting gelsemium and later helps Chrome prevent Senku from retaliating over Chen Yu’s poison experiment 33.

Ruri’s Recovery

• Helps pass Suika’s damaged watermelon helmet to Senku during his bout with Ginro, enabling his decisive counterattack 36.
• Carries alcohol and vinegar after Senku when he leaves the marriage ceremony to finish the Special Medicine 37.
• Cries when the medicine is completed and supports Ruri’s decision to take it. Ruri subsequently recovers after the combined course of Chen Yu’s herbs and Senku’s medicine 38.

Defense Against Hyoga

• Fights Hyoga with Kinro and Magma, using experience gained from Chen Yu’s demonstrations 45.
• Is prevented by Senku from pursuing the retreating attackers 46.
• Resumes intensive training as the village prepares for the approaching decisive battle 47.

Notable Quotes

“What do you mean, gorilla? Even ‘lioness’ sounds better!” 11

“Don’t worry. I’ll definitely learn it!” 31

“Yay~ I can finally learn martial arts!” 44