Synopsis

Siblings Yuuhi and Yuamu Oudou inherited their parents' company and now run the Alien Trouble Consultancy, which does exactly what it sounds like—hunts aliens. Neither of them has actually encountered one yet, but Yuuhi's desperate to change that. He's convinced an alien stole something precious from him: an object called the Earthdama. While scouting for extraterrestrials in the forest, the two stumble across a weird clearing where fallen trees form a pattern oddly similar to a crop circle. They push deeper and discover a spaceship, then curiosity gets the better of them and they climb inside. That's where they meet Yuudias Velgear, an alien from the Velgear Star Cluster. Turns out Yuudias isn't there by accident—he's searching for knowledge about Rush Duel, a card game that's huge with elementary school kids, because he believes it's the key to ending a devastating war on his home world. The siblings agree to teach him about the game, but it quickly becomes clear that this first contact might be more than just a lucky break.

Content compiled by AnimeList.moe from publicly available sources.

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