High school senior, male. Height: 171cm Blood Type: A Ability: Luminescence He can make his body glow at will. Because it's so underwhelming, he's often teased for it (and has a complex about it). Nickname: Pikarun. A sensible person and one of the few "straight-man" types. He's occasionally treated as a loner, but he's not excessively introverted. While his original personality was somewhat cynical, he swapped with Kuroi and became a typical extrovert—innocent, simple-minded, and friendly with everyone. Surprisingly, he has some comedic potential too. He likes Cerberus and tsukemen. His way of speaking has become incredibly bright and cheerful like a social butterfly. He generally calls classmates by their surnames. Masayoshi Kuroi is his best friend. He tends to keep a slight distance from other classmates, but he doesn't avoid socializing and has built relationships where he can talk fairly easily.

High school senior, male. Height: 178cm Blood Type: AB Ability: Supergravity Celestial Body (Black Hole) As the name suggests, he can transform his body into a black hole or generate small-scale black holes. As a drawback, he must post cringey poems on X (formerly Twitter) after use. Nickname: Masa. One of Hikaru's few best friends. He plays the "funny-man" in most situations and is often led astray by the many eccentrics around him. His original personality was innocent, simple, and extroverted, but after swapping with Tata, he became somewhat cynical. His way of speaking has become listless and low-energy. He has a side that is stubbornly particular about strange things. He dislikes haunted houses and people named Saito who use the complex kanji for "Sai."

High school senior, female. Height: 158cm Blood Type: A First person: I (casual/feminine) Ability: Future Sight (Vision) She can see up to five years into the future. If she sees too much, her brain shorts out and she becomes unable to move (though pouring something cold on her helps). She is close friends with Shoko Taira; they are always together, chatting away. She's the type who casually does amazing things. Her catchphrase is "I'm stupid, so I don't really get it, but..." yet her grades are reportedly better than Hikaru's or Masayoshi's. She has long brown hair. A gal (gyaru). Her personality swapped with Shoko's, but it hasn't changed much. She basically calls everyone by nicknames.

High school senior, female. Height: 160cm Blood Type: O First person: I (casual/feminine) Ability: Parallel World Movement (Butterfly Effector) She can move to adjacent timelines. Except for herself and Mirai, it's said that if the same person from a parallel world collides, they undergo mutual annihilation. Nickname: Heko. She is close friends with Mirai Misato and they are always chatting. She casually hops between timelines with a simple "Wanna go parallel?" She's the type who casually does amazing things. Her grades are also reportedly better than Hikaru's. A gal (gyaru). Her personality swapped with Mirai's, but it hasn't changed much. She basically calls everyone by nicknames.

High school senior, female. Height: 156cm Blood Type: B Ability: Landmine Explodes when someone touches her and then lets go. The explosion cannot be stopped, but the power can be weakened. It applies to everyone except those she recognizes as "family." She can also self-destruct. Nickname: Riko-tya. A student characterized by black hair in twin tails tied with pink ribbons. She has a gloomy aura and likes Monster Energy, appearing at first glance to be a typical "menhera" or "landmine-kei" girl. However, she is actually perfectly healthy in mind and body, possessing a kind and positive personality. After swapping with Busujima, she became a sharp-tongued but kind person. She is surprisingly good at going along with others.

High school senior, female. Riko Yamikawa's friend. Library committee member. Birthday is July 19th. Characterized by sanpaku eyes and a purple bob cut. Nicknames: "Bussu" (by Masayoshi Kuroi), "Sumi" (by Riko Yamikawa and Shoko Taira), or "Sumisumi" (by Mirai Misato). She dislikes the name "Bussu" and gets angry when called that. Favorite food is acai bowls. She used to be sharp-tongued but kind, but after swapping with Yamikawa, she became gentle and positive. Ability: Poison (Charge Type) Poison is generated within her body, and if it exceeds her capacity, it overflows from her entire body. Therefore, she needs to "drain" the poison regularly. When the poison is drained, her hair color changes from purple to black, and she becomes meek. (She usually vents the poison through her sharp-tongued remarks and retorts.)