The background to and depiction of a watershed battle in Japanese history, at Sekigahara in 1600, when Tokugawa Ieyasu's Army of the East defeated the Army of the West of Ishida Mitsunari. The story includes the intrigues and shifting loyalties of the various retainers, family members, and samurai.

Kiriko is pretty girl, working at an office. She also binge eats and then makes herself vomit. The male workers like her, but female workers hate her. Kiriko believes that the only that matters for a woman is being cute. Kiriko has Yuto, who works at a bar. The relationship between Kiriko and Yuto is more than friends, but less than a romantic relationship.