"Hundred Stories" is a supernatural anime series that revolves around a mysterious urban legend known as the "Hundred Tales." The narrative centers on a group of individuals who become entangled in a series of eerie and interconnected events tied to this legend. According to the tale, if one hundred ghost stories are told in a specific location, a supernatural phenomenon will occur, summoning spirits or curses into the real world. The series explores the consequences of this legend as characters inadvertently trigger its activation.

The protagonist, a high school student named Haruto, stumbles upon the legend after hearing rumors from classmates. Curiosity leads him to investigate, and he soon discovers that the stories are more than mere folklore. Each episode delves into a different ghost story, often tied to a specific character or location, revealing the dark histories and unresolved emotions of those involved. As Haruto and his friends delve deeper, they encounter vengeful spirits, cursed objects, and haunted places, each with its own tragic backstory.

Key characters include Haruto, who serves as the audience's entry point into the unfolding mystery; Aya, a classmate with a keen interest in the occult; and Riku, a skeptic who becomes reluctantly involved. Their interactions and evolving relationships are shaped by the escalating supernatural threats they face. The series balances episodic ghost stories with an overarching plot, as the characters work to uncover the truth behind the Hundred Tales and prevent the impending catastrophe.

The narrative structure alternates between self-contained ghost stories and the progression of the main plot, creating a blend of horror, mystery, and drama. Themes of guilt, regret, and the consequences of unresolved emotions are prevalent, as many of the spirits are tied to past traumas or misdeeds. The series maintains a tense atmosphere, with each episode building toward the eventual climax, where the full scope of the Hundred Tales' power is revealed. The story concludes with a resolution that ties together the individual tales while addressing the fates of the main characters.