A Japanese mystery bestseller, revolving around a series of unsettling floorplans, in which the reader is the detective - from the Youtube sensation Uketsu. A mysterious windowless room on a house's floorplan hints at a hideous secret A young girl suspects that her cousin's seemingly accidental death was the result of a sinister family tradition Can you uncover the dark secret of these strange houses? When you do, an unforgettable truth will be revealed.

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