吾妻 聖

She is a school nurse at Shougo's school. She is a lustful older woman who loves sex and has an uninhibited personality. She is also not afraid to tell stories about her sexuality.

She has a lot of experience in love, or rather sex. She is the type of person who has sex as soon as she gets together with a guy, and she places a lot of importance on the chemistry of the lower half of her body. However, according to her, “I have very bad luck with men"

In a fit of desperation, she steals Shogo's virginity. Since then, she has been enjoying sex with him every day. And then, she learns about Shouko's hidden naughty fantasies that never stop and welcomes her into her sex life with Shougo.