In Kawakami City, having a samurai ancestor and 'fighting spirit' isn't just an interesting fact, it dictates how you're ranked on the social totem pole. Fortunately, that's something kids like Yamato Naoe have learned to deal with by forming into small 'bands,' (that's the samurai type, NOT music.) However, the delicate balance of Yamato's group is thrown off when two more girls join the group.