故事发生在名为四皇町的街道之中，立华律香（茜屋日海夏 配音）是一名正在读高中二年级的平凡少女，和母亲过着相依为命的生活。某日，学生会会长钩贯雷姆（齐藤壮马 配音）忽然找到了律香，将她带往了学生会的据点“第三图书馆”。在那里，新世界的大门在律香的面前打开，就此，律香进入了一个恶魔、吸血鬼和驱魔师互相制约挑战的异世界。因为会说甜言蜜语而在女生之间享有极高人气的楚神乌列（近藤隆 配音）、行事桀骜不驯张扬跋扈却有着细腻柔软内心的南那城梅吉（木村昴 配音）、个性古怪对艺术有着崇高追求的枣坂四季（平川大辅 配音），在这些幻化成人形的魔怪们的围绕下，律香会遭遇怎样的故事呢？
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