Seijun Kanojo no Teisou Kaijo ~Kareshi ni Naisho de Kimoota ni Okasareru Watashi~ The Motion Anime

The main heroine of the hentai, Mayu Asami, is a very quiet and modest girl with a nice figure. She has sincerely loved and been dating her childhood friend Asahi Yamagishi for some time. They haven't progressed much in their relationship yet, let alone their first kiss. Mayu loves cosplay and participates in almost all themed events. However, at one of the meetings, she was attacked in the restroom and raped. After that, Mayu was blackmailed, and gradually the girl became a sex toy ready for anything...