45 minutes of pure visual violence. Saya moves through that army base like a predator through water, and the animation doesn't waste a frame explaining who she is or why she hunts. You get the style, the brutality, the atmosphere, and then it's over before the story has time to ask for your investment. That's the entire point. Animation this fluid and designs this sharp don't need a runtime to justify themselves. They are the film.

Teropterids are monsters that pass for human and exist only to feed on human blood, and groups exist to wipe them out. The finest of these hunters is Saya, a brooding, enigmatic girl. In Japan during the 1960s, she is dispatched to a U.S. army base that may be overrun by the creatures. The film is a supernatural horror piece built around her mission.