Eruna steht vor ihrem Wechsel in die Oberstufe. Aber in welche? Sie folgt eine, Vorschlag ihres Cousins, und das Abenteuer fängt an.
As Eruna Ichinomiya, a somewhat perverted schoolgirl, is pressured into choosing a high school, her cousin, Shigure Ninomiya, recommends his school, Mikagura Private Academy. Taking an interest in the principal's granddaughter, Seisa Mikagura, Eruna decides to take the entrance exam, which she passes by being able to see the school's feline teacher, who she names Bimii. At the start of her new school life, Eruna learns about the school's system, in which students are required to join one of the school's clubs, using points earned by battles against other clubs to improve their state of living. Stuck with the poorest living conditions due to not yet being in a club, Eruna attempts to join Himi Yasaka's Calligraphy Club, but is rejected due to her poor art skills. A few days later, however, Eruna is approached by Seisa herself, who invites her to join her Going-Home Club on a trial period on the condition that she act as the club's representative in a battle taking place the next week.
ある日、従兄である二宮シグレから私立ミカグラ学園のパンフレットを渡された一宮エルナは、そのパンフレットに写っていた御神楽星鎖の姿に目を奪われる。彼女に運命を感じたエルナはミカグラ学園への進学を決意する。しかし、文化系の部活しか存在しないというミカグラ学園にやってきたエルナが見たものは、必殺技を駆使して戦いを繰り広げる生徒たちの姿だった。
지망 고교도 정하지 않고 미연시나 하고 있던 이치노미야 에루나. 사촌인 니노미야 시구레는 자신이 있는 학교로 오지 않겠냐며 그녀에게 팜플릿을 건네주는데…
