It is the Taisho Period in Japan. Tanjiro, a kindhearted boy who sells charcoal for a living, finds his family slaughtered by a demon. To make matters worse, his younger sister Nezuko, the sole survivor, has been transformed into a demon herself. Though devastated by this grim reality, Tanjiro resolves to become a “demon slayer” so that he can turn his sister back into a human, and kill the demon that massacred his family. (Source: Crunchyroll)

利用检测杀意的系统“罔象女”搜查犯罪事件的组织，通称“仓”。 然后，神探·酒井户身为“罔象女”的操作员进入犯人的深层心理“杀意世界（井）”，对事件进行推理。 他不断追寻着频繁发生、谜团重重的凶恶事件，以及在其中若隐若现的连续杀人鬼制造者“约翰·沃克”的影子。