When a writer fascinated by the macabre is approached by an acquaintance, he finds himself investigating an eerie house for sale in Tokyo. At first, with its bright and spacious interior, it seems the perfect first home. But upon closer inspection, the building’s floor plans reveal a mysterious "dead space” hidden between its walls. Seeking a second opinion, the writer shares the floor plans with his friend Kurihara, an architect, only to discover more unnerving details throughout. What is the true purpose behind the house’s disturbing design? And what happened to the former owners who disappeared without a trace? When a body suddenly appears and a young woman reaches out about a second house, it soon becomes clear that the writer and his friend may be in over their heads.

A pregnant woman's sketches on a seemingly innocuous blog conceal a chilling warning. A child's picture of his home contains a dark secret message. A sketch made by a murder victim in his final moments leads an amateur sleuth down a rabbit hole that will reveal a horrifying reality. Structured around these nine childlike drawings, each holding a disturbing clue, mystery horror YouTube sensation Uketsu invites readers to piece together the mystery behind each and the over-arching backstory that connects them all.