A full-scale mystery novel set in schools and ordinary settings, accelerating by constantly rearranging rules and psychological battles.

A single game turns into a life-or-death puzzle.

A linked novel in which fragments of memory and incident overlap until the outline of reality begins to blur.

The world you thought you could see begins to drift, little by little.

A mystery novel that closely tracks relationships and emotions on the verge of explosion against a backdrop of social unease.

Relationships with a combustible charge slowly heat up.

A linked fantasy story set in a hotel that handles cursed objects and strange phenomena, where the guests’ circumstances and secrets tangle together.

In a hotel where protection and curses coexist, stories intersect in quiet ways.

A classic-style mystery that solves events in a sealed mansion through traditional trickery and logic.

The mansion’s mysteries unravel one by one in unsettling fashion.