既没有大城市那般的嘈杂，也没有郊外般闲暇的街道，祖师谷大藏。憧憬着怪兽娘们的组织“GIRLS”的同时，又是一名极其平凡地度过每一天的女高中生·平贺冴月。某一天，因为觉醒了不可思议力量而困惑的冴月，拯救了她的并不是她所憧憬的“GIRLS”而是自称为布莱克指挥官的怪兽娘所率领的邪恶军团“BLACK STARS（暗黑群星）”！？
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