Umi and Ai were friends in middle school. - They happened to meet again at a cram school just before their university entrance exams. - Ai, who had already been soaked in sexual desire supplements by the man, was at the mercy of the man in his desire for supplements. - The man sees a photo of Umi displayed on Ai's smartphone and urges her to introduce him to her. - Ai sold her friend to a man in exchange for supplements. - Their friendship and sexual love deepen as their bodies are played with by a man. - A body that gets dirty with the semen of many people. - What will happen to these two who can't go back to normal?