"Hyaku Monogatari" is a supernatural horror manga set in Edo-period Japan, blending historical elements with eerie folklore and ghostly tales. The narrative centers on Ino, a young man who becomes entangled in a series of supernatural events after encountering a mysterious woman named Ogin. Ino is a skilled storyteller who specializes in recounting ghost stories, but his life takes a dark turn when he is drawn into a ritual known as the "Hyaku Monogatari," where participants light 100 candles and tell 100 ghost stories. As the stories are told, the boundary between the human world and the spirit world begins to blur, unleashing malevolent forces.

Ogin, the enigmatic woman, plays a pivotal role in the story. She is revealed to be a supernatural entity with her own agenda, manipulating events to achieve her goals. Her connection to the ritual and her influence over Ino drive much of the plot. As Ino delves deeper into the world of spirits and curses, he encounters a variety of characters, each with their own ties to the supernatural. These include other storytellers, yokai (Japanese spirits), and individuals cursed by their past actions.

The manga explores themes of guilt, retribution, and the consequences of meddling with forces beyond human understanding. Each ghost story told within the ritual contributes to the overarching narrative, revealing fragments of the characters' histories and the dark secrets that bind them. The plot is structured around the progression of the ritual, with each story bringing Ino closer to a confrontation with the supernatural forces unleashed by the Hyaku Monogatari.

As the ritual nears its completion, the stakes escalate, and Ino must confront not only the spirits but also his own fears and moral dilemmas. The manga maintains a tense atmosphere, blending historical detail with supernatural horror to create a compelling and immersive narrative. The interplay between the human characters and the supernatural elements drives the story forward, culminating in a climactic resolution that ties together the various threads of the plot.