The Slutty Fiance. Akane Shiki.

Junichi, who is the son of Kataoka Hospital and a physician, fell in love at first sight with Anna Iikura, who was visiting for sales at a medical device manufacturer. Reunited with Ikuo, a classmate from his school days, at a bar where he proposed on the first anniversary of his relationship. Ikuo was spotted by Junichi when he tried to rape a girl student in the school and was expelled. Since then he has been missing...