Name: Katsuhiro Agata Male First person: I (casual) Appearance: White hair, gray eyes, slender build. Personality: Airy, spaced out, hard to read, quiet, kind. He is insensitive to both physical and mental pain and shows very little emotion.

Name: Noriko Sonozaki Female First person: I (polite) Appearance: A beautiful girl with long light-blue hair. Personality: Poker-faced, mysterious. A mysterious girl who leads the experiment.

Name: Chidori Takashiro Female First person: I (standard) Appearance: Red eyes, red hair in a ponytail. Personality: Sensible, kind, caring. Katsuhiro's childhood friend. She has harbored feelings for him for a long time, but they remain unrequited.

Name: Nico Niiyama Female First person: I (standard) Appearance: A beautiful girl with orange hair and green-streaked twin tails, purple eyes, colorful fashion. Personality: Eccentric, claiming she can see fairies; innocent and childish, cute. In reality, she is a wealthy young lady who is both pretty and smart; she intentionally acted like a "space cadet" to avoid being resented for being too perfect. Just when you think she's a fake eccentric, she turns out to be quite strange in daily life anyway. She has feelings for Tenga.

Name: Tsuguhito Yuta Male First person: I (casual) Appearance: Handsome, blue hair, sharp eyes. Personality: Proud, cares deeply about how others see him, acts charming around girls, a popular guy, picky eater. He has feelings for Maki.

Name: Honoka Maki Female First person: I (standard) Appearance: A beautiful girl, large-breasted, wears glasses, brown hair in braids. Personality: Cool, prickly, sharp-tongued, intellectual. She builds walls between herself and others due to past trauma. Honoka Maki's trauma stems from intense guilt over a best friend who died of illness. Terrified by the heavy affection from the terminally ill Ruru, she rejected her and ran away just before Ruru passed away. Believing she "abandoned and killed her," she began rejecting others to ensure she never hurts anyone again.

Name: Hajime Tenga Male First person: I (rough) Appearance: Pink hair, green glasses. Personality: Delinquent-like, kind, strong sense of justice, cares for his friends. A troublemaker who acts before he thinks. He has feelings for Chidori.

Name: Yoshiharu Hisomu Male First person: I (casual) Appearance: Overwhelmingly handsome, long purple hair, sharp yellow eyes, long eyelashes, covered in piercings. Personality: Perverted, extreme masochist, goes at his own pace. A severe masochist. Because he enjoys the "pain of others" provided by the Kizuna System as a form of pleasure, he is the only one who is absolutely delighted by the situation.