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Sentai can be translated to "task force" and a lot of Japanese anime/manga/live action shows are generally aimed at children with the main characters as protectors of Earth where they can transform and gain superpowers. Ever seen Power Rangers? That's a Super Sentai series.
Wonder 3 takes place in an alternate Earth in the year 196X and the world is overrun with war and violence. The Galactic Federation consisting of all the advanced species of the universe convene to decide the future of Earth, but due to a lack of information they decide to send an elite team, Wonder 3, to observe human species for one year and determine whether or not humans are worthy of saving. Upon landing on Earth, the three members of Wonder 3 - Bokko, Nokko, and Pukko - disguise themselves as animals and come across the two Hoshi brothers who defend humanity in their own way. With a time limit of one year, what can Wonder 3 learn from the Hoshi brothers about life on Earth?