Mamoru Akasaka, Oishi and the assistant visit the abandoned village in 2007. They learn about the Great Hinamizawa Disaster that decimated the town and the connection to Takano's File No. 34. The adult Rena survived the disaster, because she was detained at the police station during the incident. She shares with them the little knowledge she has about Rika's strange behavior shortly before the supposed "gas leak". Akasaka recalls his meeting with the young Rika. The episode is a direct epilogue of Tsumihoroboshi-hen.