Yui Ameno is a first-year high school student in an all-girls school who is socially awkward and struggles to make friends. She isn't close with anyone in her class, except for the popular model student Fumiko Kihara, whom she admires. One day, Fumiko confesses her feelings to Yui, and they start dating, but on one condition: Yui has to play along with Fumiko’s masochistic fantasies.

[From itch.io]