Nora lives together in Sakuragabuchi with Shachi, a girl younger than him whom his mother had adopted. After his mother’s passing, they were able to grow up just fine with the support of those around them. Shachi loves Nora very much, and wakes up him every day while straddling him in bed. Then they head to school and enjoy their time with their friends, including their childhood friend and discipline committee head Michi, and his cheerful gyaru-like kouhai Yuuki.