This volume follows Tooru Oshikiri, a boy left alone in his family's sprawling mansion while his parents work abroad, across six interconnected chapters of creeping psychological horror. He starts seeing long-necked figures in the house, hears about a nearby bog that traps anyone who wanders too close, and befriends a girl with unsettling pen pals. With each new incident, small details of his own reality shift, as if the mansion itself is rewriting what happened before.