At Kawakami Academy, where devotion to samurai tradition doubles as a measure of social standing, master fighter Kawakami Momoyo settles disputes with her fists as often as her wit. New transfer students from Germany, led by Christiane Friedrich, throw the school's routine into chaos as they try to find their footing among Momoyo's tight-knit circle of friends, including Yamato Naoe and Miyako Shiina. Manga chapters follow the fallout from the new arrivals through Momoyo's exploits and rivalries at school.