During a dinner party at a secluded mountain villa, while the invited guests are engaged in a strange game over an ultraluxury clock, the owner of the villa, a female writer named Mori Reiko, is met with an unnatural death in her study. With this, the curtain rises on a deadly game of deduction! Embroiled in the game are Enomoto, a crime prevention consultant (whose main profession is a thief!?), and the lawyer Junko, who tries to solve the mystery of a perfectly locked room protected by the wall of time… Note: Wall of time here means alibi.