In a forgotten town known as the old capital of Tokyo, strange and mysterious crimes are progressively occurring. These supernatural occurances are beyond comprehension and bring fear and terror to the people. Only one person is not intimidated by the evil underlying these occurances and is willing to challenge the: Hyuga Mayuki, a young boy detective who holds a special insight power that allows him to uncover the real truth behind these occurances.
故事发生在三十年后的东京,在这个被称为旧都的已经荒废了的地方,发生了一系列奇怪的犯罪事件。这些事件被知情人称为“幻梦事件”,而频繁发生“幻梦事件”的街道则成为了人们口中的“迷宫”。在这里,有一位十一岁的少年侦探想这些蠢动的恶行发起了挑战。他就是主人公日向茧树。这位聪明、天真、可爱的少年侦探和管家晴岚、女仆初实一起,通过自己不可思议的能力“神智”,来解决这一系列的奇怪事件。