A threatening letter arrives for the graduates of Keiei University’s Drama Research Club: — “If you want to know who killed Kimura, and the truth from eight years ago, come to the Hinazuki Hot Spring Inn ‘Gokuraku’ at 2:00 PM on January 9, 2024.” Gathered there are four former members — Niwada, Sakumoto, Hatori, and Inami. On the night Kimura died, each of them, then seniors in the drama club, was hiding a secret. Now, as they reunite after eight years, the curtain rises once again on a mystery woven from lies, guilt, and buried truths.