No Game No Life: Chapter 2 Eastern Union Arc, Vol. 1 (Manga) - Ryu Naitou

A world governed entirely by games does not favor a timid, powerless race like Immanity, but it's perfect for a pair of legendary shut-in gamers! Sora and Shiro are now king and queen of Elkia, the last bastion of Immanity. But saving a kingdom is no small task, and responsibility isn't a game either sibling claims to have a high score in... Good thing the allure of more challenging contests (and sexy animal women) is all the motivation they need to set their sights on a new conquest--Immanity's powerful neighbor, the Eastern Union!