《Crazy Rain》是Stay Night Mystery系列的第一弹，此系列共有三部作品。暴雨夜，聚集在杀人现场live house的四个警察各自有着秘密。禁忌的恋爱、与嫌疑人合谋、和暴力团暗中联系、杀人。互相知道秘密的四人互相欺骗，使尽手段。最黑的是谁？
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