Ryo Arase is a lazy high schooler getting by on his own, juggling a part-time job with school and constantly clashing with the strict teacher Rinko Yoshitaka, who reprimands him for every assignment he fails to hand in. What no one at school realizes is that the two are already a couple: when Arase heads home, Rinko is the one waiting for him. They guard the secret carefully, since neither of them can afford for anyone at school to notice.