Kawakami City is famous for its strong dedication to its samurai ancestors. A strong fighting spirit is always valued and it's even an important factor in succeeding in school there. Yamato, a second year student from Kawakami Highschool is always with his close friends (4 boys and 3 girls). They have known each other since they were young and have done loads of things together. They have many other friends, but these seven people are a close-knit group, they even have a secret base where they meet... With the new semester, they welcome two girls into their group and shortly after things start to change...