Touma Kusaka differs from the other members of the Choshu Clan because he lacks their anti-foreigner prejudice. Following a reunion with Keiichirou Akizuki, a vassal of the Tokugawa family who previously assisted him in evading government authorities, the two start studying English in secret. As they keep meeting despite the hostility between their families, a romance begins to develop between them. However, with war approaching between their respective clans, Kusaka and Akizuki's hope for a world where they can be together might never be realized if their duties and bloodlines stand in the way.