Two years after graduating from vocational school, Masami (Aya Sasami) moved in with Naoki (Ota Osamu), her former lover from Tokyo. Feeling isolated and craving connection, she decides to visit Misa (Misa Saki), her aunt's beautiful coffee shop owner in downtown Tokyo, and asks to stay with her for a while. Misa welcomes Masami, but her husband Takuya (Yasushi Takemoto) strongly objects. With only one bedroom upstairs, he's hesitant to have a young woman staying. However, Takuya eventually agrees. That night, strange occurrences begin, stemming from a peculiar "river character" that seems to be living in the house.