Yu-Gi-Oh! GO RUSH!!

After inheriting their family business, siblings Yuuhi and Yuamu Oudou take charge of the Alien Trouble Consultancy, an organization dedicated to tracking down extraterrestrial visitors. Despite never actually encountering an alien, Yuuhi is determined to find one, convinced that an otherworldly being has stolen his prized possession known as the Earthdama. During one of their searches, the siblings stumble upon a bizarre clearing in the forest where toppled trees form a pattern resembling a crop circle. Following the trail deeper into the woods, they discover a mysterious spacecraft and step inside out of sheer curiosity. To their astonishment, they meet Yuudias Velgear, a genuine alien from the distant Velgear Star Cluster. Yuudias has traveled to Earth with a singular mission: to master Rush Duel, a card game wildly popular among elementary school students. He firmly believes that understanding this game holds the key to ending a prolonged war ravaging his home world. The siblings agree to teach him the rules, but as their unlikely partnership forms, they begin to suspect that this extraordinary first contact was far from a random coincidence.