Toritsuki ~Kanojo ga Akuma de Akuma ga Kanojo~

"My osananajimi has been possessed by a devil...." Yasuharu soon visits Kusuha's house and meets a strange girl, Ril. According to Ril, she was just called to this world by Kusuha. Yasuharu tells Ril to get out of Kusuha's body, but she refuses.... Well, he decides to learn how to remove Ril out of Kusuha's body. According to a manual, it will take seven days to master it. Will he be able to save Kusuha...? [Edited from ErogeShop]