Strange House Set (manga + book + bookmark)

Have you noticed something strange?
At first glance, it seems like an entirely ordinary house. But if you take a closer look at the layout, you can find many unusual, even ominous details. With each passing second, the tension mounts, and... finally, the scattered pieces come together to reveal the truth about this house. A horrifying, incredible truth.

In my work, I often encounter various mysterious incidents related to houses. But this story is unlike any other…
When an old friend reached out to me asking to take a look at an unusual house plan he was considering buying, my attention was drawn to the mysterious empty space on the first floor. So, I contacted a familiar architect, Kurihara. He was immediately intrigued by the unconventional layout, noting several oddities: a children’s room without windows, the suspicious arrangement of rooms, and a secret passage… Kurihara proposed a wild theory, which would have remained just that if a dismembered body without a left hand had not been later found nearby.

Below is the entire story in chronological order. Some details are concealed to maintain confidentiality.
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The book contains over 50 schematics and layouts that will help immerse you in the plot and become an active participant in the investigation of the mystery of the strange house.