An optimistic, no-nonsense girl who's quick to act. On her period, she's usually straightforward but will act sweet towards guys. First person: I. Second/third person: uses names without honorifics. For Japapa, she calls him "Jappi."

A sweet-toothed, worrier, fluffy girl. When she gets cramps during her period, she gets a little teary-eyed. Uses polite language. First person: I. Second/third person: uses -san.

A genuinely airheaded character who calls herself a genius. On her period. First person: Luna. Second/third person: uses -san. Uses polite language.

The cute girlfriend of Chiroru. When she's on her period, she's super sweet and dependent on Chiroru. First person: Pino. Second/third person: uses -san.

Pino's reliable boyfriend. He's doing what he can for Pino while she's on her period. A boy.

Japapa: A kind and reliable leader. He's supporting Noa through her period. Naokiri: A kind, teacher-like figure who uses polite language. He's supporting Eto. Hiro: A gentle sheep prince. Tatsun: Speaks with a Kansai dialect. He'll support you.

Boy A: "You're bleeding from your crotch? Eww, that's so gross." Boy B: "Stomachache? We come to school even when our stomachs hurt, so don't you dare take a day off." Boy C: "Bleeding from your crotch? Liar. I can tell that's a lie in a second."