Yu☆Gi☆Oh!: Go Rush!!

Yuuhi and Yuamu Oudou are siblings who have recently taken over their parents' company, Ultraterrestrial Trouble Solutions. This organization specializes in hunting aliens, and Yuuhi is eager to find one as he believes one has stolen an important item called the "Earthdamar".

One day, the siblings come across a strange spot in the forest with many fallen trees, resembling a crop circle. Intrigued, they explore further and find a mysterious spaceship. Inside, they meet Yudias Velgear, an alien from the Velgear Star Cluster. Yudias is looking for information on Rush Duel, a card game popular among elementary school students, as he believes it can save his home from a long war.

The siblings agree to teach Yudias about Rush Duel, and soon realize that their first contact with an alien may not be a coincidence. Yu☆Gi☆Oh!: Go Rush!! follows their journey as they work together to save Yudias' home.