Love Beast: Attack! (1981)

"Leave red claw marks on your white skin!! A beast-like body that becomes tough after being raped."

A high school girl gets molested by her mother’s current lover. He is a sleazy detective working on the yakuza drug trade. The girl runs away from home but returns five years later with a newspaper article describing her mother’s apparent suicide. Within the corruption of a decaying shipping port she is determined to find the truth behind her mother’s death and what happened to her younger sister who had stayed behind.