The aliens land in Tokyo and the show just... doesn't care about explaining why. Momoko decides to fight them anyway, and for five episodes you're watching a girl in a cheap sailor suit punch aliens while the animation shifts into crayon drawings whenever something weird happens. The absurdity isn't ironic or self-aware, it's just how this world works, and by the third episode you stop asking for it to make sense and start laughing at the art style shifting like the budget ran out mid-scene.

Momoko dreams of becoming an idol, but her ordinary life shatters when an alien armada descends on Tokyo with conquest on their minds. The invaders serve Warudemon, a ruthless king determined to claim Earth as his own. When Momoko gets swept into the conflict, she discovers she has the power to transform into a magical warrior capable of fighting back against the extraterrestrial threat. Warudemon turns a range of schemes on her and the people close to her, and Momoko resolves to stand against him. The short ONA, adapted from a 1987 arcade game, blends schoolgirl dreams with alien invasion, mixing magical girl action with sci-fi stakes.