After inheriting the company from their parents, siblings Yuuhi and Yuamu Oudou have started to work at Ultraterrestrial Trouble Solutions, an organization that hunts aliens. Although they have never encountered aliens before, Yuuhi is desperate to meet one as he believes that an alien has stolen his important item called the "Earthdamar." One day, while searching for extraterrestrial creatures, Yuuhi and Yuamu find a strange spot in the forest where many trees have fallen, forming a scenery similar to a crop circle. As they venture further, they discover a mysterious spaceship and enter it out of curiosity. To their surprise, they come across Yudias Velgear, an alien from the Velgear Star Cluster. As it turns out, Yudias is seeking to learn about Rush Duel—a card game popular among elementary school students—as he believes that it will save his home from a long war. With the siblings agreeing to teach Yudias about Rush Duel, they eventually realize that their first contact with an alien may not be a random coincidence.

A tournament to decide the strongest Vanguard cardfighter "Deluxe," Akina and the other fighters have received an invitation to the tournament. This time, many legendary fighters will also be participating!

Two neighboring childhood friends. An airheaded girl and the boy who takes care of her like a mother hen. And of course, there is his family background with a tiny, insignificant supernatural secret. Now that her parents have left the girl in their neighbor's care, will she ever discover her friend's secret?