"Toire no Hanako-san" is a supernatural anime series centered around the urban legend of Hanako-san, a ghost said to inhabit school bathrooms. The narrative unfolds in a high school setting, where students encounter strange occurrences tied to the legend. The protagonist, a curious and brave student, becomes entangled in the mystery after hearing rumors about Hanako-san. Alongside a group of classmates, the protagonist investigates the ghostly phenomena, uncovering dark secrets about the school's past and the true nature of Hanako-san.

The story delves into themes of fear, curiosity, and the consequences of meddling with the supernatural. As the students dig deeper, they face increasingly dangerous situations, with Hanako-san's presence growing more menacing. The series balances moments of tension and horror with character-driven interactions, exploring the dynamics between the students as they confront their fears and work together to unravel the mystery. The plot progresses through a series of episodic encounters with supernatural entities, each tied to Hanako-san's legend, culminating in a climactic revelation about her origins and the tragic events that bound her to the school.

The main characters include the protagonist, whose determination drives the investigation, and a diverse group of classmates, each contributing unique perspectives and skills to the group's efforts. Hanako-san herself is portrayed as a complex figure, blending elements of folklore with a deeply personal backstory that adds emotional weight to the narrative. The series maintains a steady pace, blending horror, mystery, and character development to create an engaging and atmospheric story.