Haruko Tezuka, a cheerful and observant fifth-grade classmate of Mikio Osawa, shares his capacity to perceive ghosts. Her awareness of this shared ability enables her to detect Mikio’s suppressed ties to the supernatural, even as he resists acknowledging them due to unresolved past trauma.

Her looming relocation to another town ignites Mikio’s inner turmoil, compelling her to urge him to confront his fears before their inevitable separation. Interactions between them reveal a spirited yet unpredictable nature, marked by shifting emotional reactions to the challenges they face.

Functioning as a catalyst for Mikio’s growth, she advocates persistently for honesty and acceptance of their ghostly encounters. Her role is interwoven with the story’s supernatural themes, her ghost-seeing ability mirroring Mikio’s and anchoring their unique bond within the narrative’s mysterious framework.