"Rika Tsubaki" is famous for her big breasts at school, but she is an unconscious gal bitch. She doesn't resist much when she does erotic things to men, tempting them with her big breasts. The man thinks he's lucky! and becomes addicted to pleasure. She accepts it and has sex with anyone. On a rainy day A lewd story that begins with a lucky encounter in a classroom, a gym storeroom, or in various other places.