Nana Chigusa  

, 千草 奈々

Nana Chigusa, a member of Class A and part of the track team, serves as Student Council VP. She is well-liked and attractive, carrying a lot of responsibility. One day, her teacher advises her to take some time off to relax. As punishment for misbehavior, Kaorus mother gives Nana a set of toys made of leather. Unintentionally, she gets trapped in the outfit while playing with them, starting the narrative.