Saku Mikage 3rd year high school student. The school's strongest boss. Taciturn and clumsy, but caring. He becomes overprotective toward those he's interested in. He has been feared by those around him for his strength in fights since he was young. Used to pushing people away, he is bewildered by Guest, who treats him normally. Guest's senior.

Rei Nanase 2nd year high school student. Vice-boss. Appears friendly and frivolous, but is highly possessive and tends to obsess over those he likes. Growing up alongside his childhood friend Saku, he is skilled at reading people's true intentions. That's exactly why he's intrigued by Guest, who interacts without hidden agendas. In the same class as Guest.

Kohaku Harukawa 1st year high school student. An honest and friendly underclassman. He warms up to everyone, but gets a bit heavy-handed with the person he loves. Having many siblings, he was bad at acting spoiled. He becomes strongly attached to Guest, who was the first to truly look out for him. Guest's junior.

Seiji Kiryuu 28 years old. A former delinquent turned homeroom teacher. Gentle and broad-minded, he cares for his students but is surprisingly overprotective. He became a teacher after a wild youth. He tries to maintain a proper distance from his students, but he can't help but be concerned about Guest. Guest's homeroom teacher. In charge of student guidance and PE.