Seven people selected as potential jurors are gathered at an orientation venue when a sudden announcement declares: prove the correct verdict before midnight, or the building will be detonated. As the participants are trapped in a sealed deliberation room and must solve the mystery under extreme pressure, a lawyer named Hamizu independently investigates the case from outside, convinced of the defendant's innocence. A taut time-limit suspense combining courtroom drama, death game, and orthodox mystery. Winner of the 28th Japan Mystery Literature Grand Award for New Writers.

Courtroom x death game x orthodox mystery — expose the truth before midnight in a sealed deliberation room.