Mirai becomes a superhero by accident, trapped in a suit her brother designed for himself, and spends six episodes proving she's better at the job than he ever would've been. The show treats this premise, sister outshining brother through sheer competence and improvisation, as both comedy and genuine character arc, never once letting the joke undercut her. Early 90s OVA energy means it swings for both sincere action beats and absurdist humor without apology, staying loose enough that neither one kills the other. Machinegal and his android squad give you something to fight against that isn't trying to be profound. This is what happens when a show knows exactly how long it needs to be and refuses to overstay it.
When inventor Hiroshi creates a revolutionary shrinking device called the Mol Unit, he imagines himself as Tokyo's greatest protector. His dreams crash immediately when his sister Mirai tinkers with the suit's settings, accidentally trapping herself inside with powers she never asked for. Now Mirai finds herself the reluctant hero of the city, armed with a suit that can shrink her down to microscopic size and back again. Standing in her way is Machinegal, a villain orchestrating increasingly absurd schemes through an army of android women who are almost as chaotic as they are dangerous. What follows is pure comedic chaos: Mirai stumbling through rescue missions while bickering with her dorky brother, battling over-the-top androids, and discovering that saving the world is way messier than any instruction manual could prepare you for. Moldiver blends slapstick humor with genuine action beats, creating something that feels like Saturday morning adventure wrapped in 90s anime energy. It's lighthearted but never boring, with a heroine who'd rather be doing literally anything else than saving people.