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...

2012年、神奈川湘南――。 稲村学園に通う 長谷大（はせ ひろし） はそこで無難に過ごしていたが、同級生で不良と近隣から恐れられる少女・辻堂さんが雨の中、猫を助けているという聞いたことのないような衝撃的な場面を目撃し、ギャップから彼女のことが気になりはじめる……。 だが彼女の周囲は不良だらけ。 ライバルの 腰越マキ や 片瀬恋奈 とも知り合うようになり、一般人だった彼の周囲は、加速度的に騒がしくなっていく――