In the summer of 1978, Hiroshi, a high school student, is so inspired by "Star Wars" that he wants to film a giant spaceship himself, so he builds a miniature one with his best friend, Yoshio, and films it with his 8mm movie camera. Terao, a camera shop clerk, suggests turning it into a narration, so he decides to make a short film to be screened at the next school festival and asks his friend Sasaki, a film fan, to help him develop a script. As he learns that his movie camera has the ability to film backwards, he comes up with a story called "Time Reverse", in which aliens attempt to reverse time on Earth in order to redo human evolution. Natsumi, a girl from his classroom, agrees to play the heroine at the last minute, so he can finally start filming it.