Umi and Ai were friends in middle school. By chance, they met again at a prep school just before taking the university entrance exams. Ai had already been given sexual supplements by a man and was at the mercy of the man in order to get the supplements. The man saw a photo of Umi on Ai's phone and urged Ai to introduce her to him. Ai sold her friend to the man in exchange for the supplements. The friendship and sex between the two deepened as the man played with her body. Her body was covered in the semen of many men. What will become of these two who can no longer return to normal...?