Nobody talks about this one because most people never knew it existed. Studio Trigger made a prequel anime that was literally locked behind a theater ticket code, a full episode of incendiary action and character work that explains why Lio matters before the film even starts. The animation burns, character animation that moves like liquid fire, combat that treats mecha like it's alive. You watch a kid become a revolutionary in twenty-two minutes. It's not bonus content. It's the missing piece that makes Promare whole.

Promare: Lio is a single-episode action and sci-fi mecha special that serves as a prequel to the film Promare. Its story is set one day before the events of the movie, and it picks up directly from Promare: Galo. It was first offered to people who saw the film in theaters, as a bonus: character cards carrying serial codes that unlocked early streaming of the episode.