AllMovie

In this largely experimental film, a group of Japanese teenagers vainly attempt to make a film about a group fo teenagers making a film about baseball. Among the obstacles they face is the theft of first base by a boy wearing a dinosaur mask, who is in some fashion invisible. As the boys search for the missing plate, they begin to become invisible, too, and see more and more odd figures around them (other invisibles). That's in the film-within-a-film. In the story, the director (played by director Sion Sono) can't finish the film because so many of his fellow teens grow up and move away.