表面上看来，索尼娅是一个扎着双马尾的金发美少女高中生，但实际上，她有着异常敏锐的神经，能够感应到突然靠近她的生物。少女折部安奈自称是索尼娅的朋友，但似乎没有得到索尼娅的认可，性格迥异的两位少女，开始了一段欢乐日常故事。
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