Momo Ayase and Ken Takakura are both high school students. While the former believes in ghosts, the latter is fascinated by aliens. Naturally, each mocks the other's beliefs. Unable to convince each other, they challenge one another to see who is right. Momo finds herself in a hospital where space creatures are supposedly located, and Ken in a haunted tunnel. It is the beginning of a thrilling romance where the occult, the paranormal, and the supernatural clash in a breathless chaos!