Houkago no Breath (Dub)

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. [Written by MAL Rewrite]

A story about mahjong.

"I can see it. The way I can win..." "This time I will beat him. So come at me again... accept! 'Bloom, gambler of souls!'" In New Kyoto, a city governed by the "King," one's worth is determined by his or her strength in the Build Divide trading card game. Rumors swirl about New Kyoto and its King. "If you defeat the King in Build Divide, any wish will be fulfilled." And in order to challenge the King, one must participate in the TCG battle known as Rebuild, and the "Key" must be completed. Everyone has a wish they long to have fulfilled. Teruto Kurabe, a boy who vows to take down the King, and Sakura Banka, the mysterious girl who guides him, throw themselves into the Rebuild battle. With New Kyoto as the stage, the curtain rises and the battle begins for Teruto and his friends! (Source: MAL News)