Kako (Fumi Nikaido) is a female high school student. She lives at a restaurant run by her family in Kitashinagawa, Tokyo. Unexpectedly, Kako’s aunt, Mikiko (Kyoko Koizumi), suddenly appears. Kako thought her aunt died 18 years ago. Her whole family is embarrassed by Mikiko’s appearance due to a past incident caused by Mikiko. Kako is also irritated when Mikiko lives in her room. They spend the summer together.

Two kids, fourteen-year-old Eriko and her thirteen-year-old brother Daigo, suddenly find themselves trapped in a parallel universe. Most things are the same as in their own world, but their parents are missing from home and are only contactable when using one particular phonecard. Based on a novel by the Akutagawa Prize-winning Fujino Chiya, and directed by the writer of Nakata Hideo’s Dark Water.