Yami Shibai 11 features the enigmatic Storyteller, a man shrouded in mystery with a yellow mask and unknown true name and origin. He appears at dusk to share dark stories based on Japanese urban legends, which are met with an unsettling acceptance by his young audience. The Storyteller uses a kamishibai, a traditional paper-scrolling device, to accompany his twisted narratives. Each episode's tale is woven from elements of horror and supernatural themes, drawing its audience into a disturbing world of fear and dread.