A6（H148mm × W105mm）

An acquaintance is looking to buy a second-hand house in Tokyo. It seems completely ordinary—bright and spacious—until a ‘mysterious space’ is spotted on the floor plan.

When an architect looks at the blueprints, he uncovers a series of unsettling irregularities hidden throughout the property.

What is the dark truth behind this bizarre layout? And who was the former resident who suddenly vanished?

The full story of the viral YouTube mystery is finally available in paperback, featuring an exclusive afterword by the architect, Kurihara.