A twin falls into love with his sister and spends forty-nine minutes unable to leave the room they share. The OVA doesn't flinch from how badly this ruins him. It treats forbidden desire not as titillation but as genuine weight, the kind that keeps someone awake at night and makes distance feel like the only honest choice.

Twin siblings Yori and Iku were inseparable as children, but lately a gulf has opened between them. Yori has turned cold and keeps his distance, even sleeping with Iku's best friend and applying to a boarding school in another city to get away. The reason is one he cannot say aloud: he has fallen in love with his own sister, and sharing a room with her keeps him awake at night. When Iku starts talking about dating and finding a boyfriend, Yori can no longer stay quiet, and he confesses. Iku loves her brother and will do anything to keep them together, but Yori wants her as a lover, not as a loyal twin. The result is a taboo drama and romance about forbidden love between twins, adapted from Aoki Kotomi's shoujo manga as a single OVA.