背景为江户时代。 作为日本桥排得上名号的大店长崎屋的少主“一太郎”， 自打出生起便体弱多病不得外出。 如此的一太郎身边有名为白泽和犬神的妖怪侍奉，时刻守护着他。 某一天夜里，瞒着周围人出门的一太郎目击了杀人犯。 以此为节点，江户开始接连出现猎奇的杀人案件……。 一太郎借助妖怪们， 开始寻找凶手——！
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