Joshi daisei: Ushiro karatsuki agete(1993)

Ayuko Tsujikura is a female college student who is seriously searching for "true love". Not only is she having an affair with Ezaki, an assistant professor at the university, but she is also dating three men at the same time: medical student Kazuhiko Odagiri and unsuccessful actor Shunichi Nakagawa. However, to Ayuko, she is in a serious relationship with each of them. Ayuko's best friend from university, Megumi, accuses Ayuko of being a villain, but Ayuko doesn't get it.