The jokes land because this show knows the magical girl genre inside and out, then treats it like five goofballs in a clubroom would. Every transformation sequence is pure ear candy, the kind of opening and ending you restart before the episode actually ends. Five friends with zero actual stakes discovering that saving the world might just be what happens when you're together in the same room after school.
Five boys inherit a mysteriously abandoned Earth Defense Club at Binan High without knowing why it exists or what it once did. Their main qualification for membership is proximity and a willingness to hang out in the clubroom after school. That changes when Karurusu, an adorable otter-prince from another dimension, shows up with an unexpected assignment: become magic knights tasked with spreading happiness across the human world as part of his planet's diplomatic expansion efforts. The catch is that Karurusu isn't the only royal with plans for Earth. His rival Rafunui, a fox-prince from the same realm, has his own agenda, and the two extraterrestrials are using our five unlikely heroes as pawns in their competing schemes. What begins as absurdist slice-of-life comedy in a forgotten clubroom becomes a series of ridiculous magical girl transformations and heart-warming missions to help troubled strangers find joy. The tone balances genuine friendship between the boys with the complete chaos of being drafted into an intergalactic happiness initiative neither side fully understands or controls.