Sada Ryuji (Kitazawa Tsuyoshi) moves into the room next door to the protagonist, Nishikawa Akane, who lives alone. Akane thinks Ryuji is a cold-hearted jerk because he rejected Akane's best friend, Ayu, but then an incident occurs... He's a horny, carnivorous, muscular man!? I can't stop my heart from pounding when I see the secret side of him that he only shows to me!