Single8.

Summer 1978. High schooler Kurita is inspired by Star Wars, and films a spaceship scene on a 8mm camera together with his friend Ozawa. When the class is discussing a project for their school festival, Kurita's suggestion to make an SF movie ends up winning. Together with their movie fan classmate Sasaki, the boys start to plan a movie and manage to convince Yamashita, the prettiest girl in class, to star as the heroine. Over the summer vacation, the four shoot their movie, "Time Reverse", where an alien spaceship arrives on Earth to turn back time in order to save mankind from itself.