Satomi is not putting much effort into her school work. She is told by her instructor that she is short of the minimum number of credits to advance. One option is for her to participate in the Robot Club, which is participating in a robot contest that is a single-elimination challenge. Satomi and the club begin working to rise to the top.

On her way to school, high school girl Nana sees a train accident. Then Nana and her friend Kanae start to come across various bizarre phenomena, including red fingerprints and a female spirit who 'lives' on the station platform. One day, Nana's younger sister is lost, and the only possibility seems to be that she had been taken by these spirits. The missing tracks. The predictions that a mysterious woman makes.