Rintarou Itoshiki, an ordinary high school boy, was supposed to be maintaining the famous sword "Muramura" passed down through his family, but before he knew it, he had been transported to another world. Furthermore, the true identity of Muramura is a cursed sword that forces the user to ejaculate as many times as the number of enemies defeated──!? To return to his original world and to suppress his overflowing abnormal sexual desire, Rintarou resolves to form a harem party and conquer dungeons. A classic fantasy x harem adventure tale begins here!!