Nintama Rantarou no Uchuu Daibouken with Cosmic Front☆Next

Under the stars one evening, a trio of ninjas-in-training watch as a shooting star hits a guy and turns him into a walking space encyclopedia. The duck boat they were hanging around somehow becomes a spaceship. That's your setup for Nintama Rantarou no Uchuu Daibouken with Cosmic Front☆Next, a TV special where the long-running ninja comedy kids from Nintama Rantarou team up with a real Japanese space documentary series to teach actual astronomy. Rantarou, Kirimaru, and Shinbei — the lovable trio who can barely pass their ninja academy classes — are now cruising through the cosmos learning about Earth, celestial bodies, and the universe, guided by their newly enlightened enemy Happousai (now calling himself "Happousei"). The whole thing plays out with that classic Ajia-do comedic energy, where the jokes land alongside genuinely educational content about space science. It's a weird and charming little blend — feudal ninja slapstick meets planetary science lesson, and it works because the characters are already so well-established from decades of Nintama Rantarou episodes. If you grew up with shows like Ground Defense Force! Mao-chan or Mon Colle Knights, where goofy kid characters stumble into grand adventures, this hits that same comfort zone. And if you've ever wanted something like Tenchi Universe but aimed squarely at a younger audience with real science baked in, this is a surprisingly solid pick. Low-stakes, funny, and you might actually learn something about the solar system.