The Kobayashi twins, Megumu and Mitsuru, were named after historical figures, but only Megumu has grown up with a taste for history. So when Mitsuru is in danger of losing his weekends to extra history classes, he convinces his sister to swap clothes with him and ace his tests! After all, how hard can it be for them to play each other?

Azusa Tokugawa was a horrible bully until Mitsuru Kobayashi helped her tame her rage. Now her tender feelings for him have left her vulnerable to the turmoil in her parents' crumbling relationship. Will the Kobayashis' offer of safe harbor be enough to give her the strength to stand against her father's plans for her?