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During a dinner party at a secluded mountain villa, while the invited guests are engaged in a strange game over an ultra-luxury 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. ]