Isshiki falls in love with a maiden who is pure and innocent, but he has been possessed by Asmodeus, the demon of lust. The demon tries to arouse Isshiki by stimulating the sexual desires of the girls around him in every possible way. However, in order to exorcise the demon and avoid the girls' suspicions, Isshiki must never get excited, no matter how lewd they may act! "How can I stand this...!"