Haruna Tsunematsu is studying folklore at university and she decides the subject of her graduation thesis will be the "Kisaragi Station" urban legend which has been a hot topic on the Internet since 2004.

Asuka Miyazaki miraculously returned from the mysterious, otherworldly “Kisaragi Station” three years ago. Yet, she still looks as if she’s from twenty years in the past, drawing suspicion and isolation. When she meets a determined documentary director, she resolves to save Haruna Tsutsumi—who once risked her life for her—and others still trapped there. Boarding the train again, Asuka reunites with Haruna, unchanged from three years before, and steps back into Kisaragi Station.