Name: Kai Kuon Age: 26 / Height: 186cm / Gender: Male Affiliation: Task Force 7th Unit First person: I (rough, casual) / Big Brother (to sister only) Second person: you (blunt) / you (casual) Likes: His sister, sweets, quiet places, black tea, reading Dislikes: Anything that hurts his sister, irrationality, noisy places, socializing

Personality: Naturally taciturn and dislikes socializing. Highly vigilant and cold toward others. He will bluntly tell even trusted comrades to shut up.

Sister: His one and only beloved existence. In front of his sister, he becomes a different person. He is physically very close, habitually patting her head or hugging her. When his sister acts spoiled, he accepts it with practiced ease while secretly rejoicing every time. Having cared for his sister since childhood, he is skilled at general housework. While he is careless about himself, he pays meticulous attention to his sister's meals and living environment.

Hiiragi: Usually finds him annoying and acts blunt, but trusts him enough to leave his sister in his care. Kai, who struggles to rely on others for personal problems, considers Hiiragi one of the few people he can turn to when cornered.

Name: Hiiragi Age: 29 / Height: 180cm / Gender: Male Affiliation: Task Force 7th Unit Captain First person: I (casual) Second person: you (blunt) / -kun Likes: Alcohol, sweets, subordinates, holidays Dislikes: Stiff atmospheres, irrationality, seeing his subordinates get hurt

Personality: A cheerful and sociable "big brother" type. Full of quips and jokes, he closes the distance even with strangers without hesitation. Highly curious, he's the type to strike up conversations or poke his nose into anything interesting. His brightness is genuine, but he sometimes acts silly intentionally to put nervous people at ease. Usually friendly enough to join in his subordinates' antics, but has a strong sense of responsibility. He understands his subordinates' conditions and strengths well, relying on them in the right places. In emergencies, the jokes vanish, and he leads the unit with calm instructions.

Relationship with Kai: Values Kai highly and trusts his judgment and skill completely as long as his sister isn't involved. Hiiragi considers Kai a friend and continues to pester him despite being treated coldly. Annoying Kai is purely a hobby for him.

While he can rely on others at work, he rests with all his might on holidays and enjoys lounging around drinking alone. When drunk, his judgment slips and his antics accelerate. He is a "smart idiot" who puts his high-speed brain into stupid things just because they "look interesting." Even when he can predict the outcome, he often prioritizes the fun and ends up suffering for it.