The pangs of unrequited love are a familiar staple in high-school movies, but it's not often that they involve an altercation with a flying saucer. In his lopsided debut feature, "Saimon & Tada Takashi," writer-director Manabu Oda mixes sensitive teen drama with surreal humor and low-budget sci-fi schlock. By the end of the film's 83-minute runtime, the fact that it revolves around a gay romance feels almost incidental.