Nanjou-san wa Boku ni Dakaretai

A story that starts with the worst possible encounter, but ends up with the sweetest couple. A serious romantic comedy about the relationship between a gal and an otaku. Kiyomi is an otaku who enjoys dating sims. One day, he encounters his classmate Eri Nanjo attempting to have sex with a classmate. Disapproving of her actions, he tells her that he is not interested in her. The next day, Eri changes her appearance to be closer to his preferences. Feeling regrets about her previous promiscuity, Eri asks Kiyomi out to teach her about real love.

https://www.cmoa.jp/title/275557/