Shinobu Otaki and Shizuno Mori, who vowed to each other for the future when they were young, became separated. Even though he has been in high school for the first time in a long time, he gets into a fight because of the discrepancy in the “promises” he remembers. Insomnia due to an unfamiliar new life. Disappointing reunion. The worst start for them. But – by chance, they realize that they can sleep if they sleep together. After that, in the school infirmary, in the Shinobi room, in Shizuno’s house. I was confused by each other who grew up differently from those days, and made a “sleeping rule” for only two people …. This is a story of two childhood friends who are frustrated, frustrated, sweet and sour, but warm … they can’t be honest. The story of them sleeping together and gradually regaining their former distance.