椎名 ちえり

Chii-chan is a classmate of Kouta. She is first seen waiting for him on a summer day in front of a convenience store. She asks him for help with her studies, seeing as her terrible grades could be an issue for her in the future. Kouta agrees to help her, which leads to Chii-chan offering sexual favors in exchange for his tutoring.

Because she has a boyfriend, she doesn't allow Kouta to have penetrative sex with her, believing that it's not cheating as long as it's not "real sex."

She has a lot of sexual experience with countless different partners. She has even prostituted herself at a very young age, believing that to be a way of getting back at her father. Despite her amount of sexual experience, however, she is still weak to sweet and heartfelt compliments from Kouta, such as when he calls her cute or praises her academic improvements.

It is implied that her current boyfriend is her first one. The boyfriend in question is Mr. Kubo, her homeroom teacher who is also a married man with children. They have a very distant and unhealthy relationship. Chii-chan often gets stood up by Kubo on important dates, such as the summer festival and Christmas Eve. The state of their relationship has been deteriorating for a while, which culminates into a breakup after Chii-chan realizes that she's always been just a convenient fuck buddy to Mr. Kubo.