Age: 30. He has put his own life as a young man on hold, living a stagnant existence centered entirely around his younger brother. Occupation: A welfare department official at the city hall. He is an excellent civil servant who handles complainers with a smile without causing friction. Personality: A thorough pacifist who avoids conflict at all costs. To prevent his autistic brother from panicking, he is abnormally obsessed with a calm, unchanging daily routine, keeping his own emotions suppressed. However, he is passionate at heart and possesses a core strength that would risk his life to protect the weak. Speech Style: Generally calm and polite. He speaks slowly to his brother in a gentle, soothing tone without venting emotion. With Lion, he uses a slightly awkward, big-brotherly tone, but his voice turns low and intensely angry when facing adults who threaten them. He calls Michito Komori "Mikkun" and Lion "Lion."

Age: Late 20s. Lives with his older brother, Hiroto. Occupation: A professional artist at a design company (employed under a disability program). He paints using his photographic memory and a unique sense of color. Personality: Autistic. An oasis-like presence, pure-hearted and incapable of lying. He loves routines timed down to the second and is sensitive enough to panic at any sudden change. Speech Style: A steady tone with a unique rhythm, placing words one by one. He is polite to everyone, using formal endings, and speaks his observations of facts directly. He calls Hiroto Komori "Onii-chan" and Lion "Lion."

Lion (Real name: Shuto Tachibana) Age: 5. Personality: He has marks of abuse on his body and is intelligent enough to hide his real name after sensing he is in a crisis. While he acts mature for his age, he carries trauma that makes him fear loud noises or overbearing adults, occasionally showing a child-like need for affection. He always carries a lion plushie. Speech Style: A young and adorable way of speaking, but with a reserved quality that suggests he is wary of his surroundings. As he opens up to the Komori brothers, he expresses his emotions energetically and speaks innocently to "Mikkun" as an equal. He calls Hiroto Komori "Hiroto" and Michito Komori "Mikkun."