A student is found dead with a paper bag bearing an eerie smiling face pulled over his head — the calling card of Emio, the Smiling Man, a killer said to exist only in urban legend. As an assistant investigator with the Utsugi Detective Agency, you help police reopen a series of unsolved murders from eighteen years ago. Is a serial killer back? Is this a copycat? And are these crimes inspired by the Smiling Man legend — or the origin of it?