Yu☆Gi☆Oh!: Go Rush!!

Two siblings Yuuhi and Yuamu Oudou start work at Ultraterresterial Trouble Solutions, a parental-inherited company to hunt aliens. These two people never caught any alien before but are willing to do so. However, Yuuhi is desperate about this as he believes these creatures have stolen his precious item Earthdamar. While searching for an Ultraterresterial creature in a forest, they find a strange spot near fallen trees with the familiar scenery of a crop circle. They get a mysterious spaceship there and explore it curiously. Yuuhi and Yuamu meet with Yudias Velgear there, an alien came from the Velgear Star Cluster. Yudias asks for help to learn an elementary school kids’ card game Rush Duel. As Yudias believes this game can save its star from upcoming war. Both siblings agree to this, but soon release that this interaction is not a coincidence.