YouTuber Amemiya (Shotaro Mamiya), who specializes in filming mysterious events, was asked by a friend to investigate an old house with strange partitions, so Amemiya found an architect Kurihara (Jiro Sato), who likes mysticism, to help analyze the floor plan. They gradually discovered strange details on the floor plan that were "terrifying when you think about it carefully", and Kurihara even made a bold hypothesis! At this time, an abandoned corpse was found near the "haunted house". Amemiya suspected that there was a horrible inside story behind it, so he decided to shoot all the doubts into a video and put it on the Internet, which immediately attracted the mysterious woman Yuki (Rina Kawaei) to provide key clues. The three of them investigated deeper and deeper, not only did they find other strange residential floor plans, but the dark truth behind them also emerged... Can you dismantle this weird mystery?