At a certain house, a son brutally and methodically murders all five of his family members after failing the bar exam. He then hangs himself, leaving behind a cassette recorder at the scene on which he can be heard saying, "Go...Go now" in unison with a strange female voice. That voice belongs to a victim of the family massacre, the elementary school best friend of teenager Akane. When the two were young they wore yellow hats and red satchels to school. Akane, who has a strong sense of the supernatural, soon begins seeing visions of a female ghost wearing a yellow hat and red satchel.