Ep. 1: Mamoru Akasaka and Assistant Investigate Hinamizawa Disaster with Officer Oishi and Rena

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In 2007, Mamoru Akasaka and his assistant visit the abandoned town of Hinamizawa to meet with Officer Oishi. They discuss the Great Hinamizawa Disaster that devastated the area and its link to Miyo Takano's File No. 34. Rena, now in her thirties, survived because she was detained at the police station during the incident. She shares limited information regarding Rika's unusual behavior just before the alleged gas leak. Akasaka remembers his previous encounter with the young Rika. This episode serves as a direct epilogue to Tsumihoroboshi-hen, continuing the investigation into the past events.