Sora (voiced by Yoshitsugu Matsuoka) and Shiro (Ai Kayano) are legendary figures known to everyone in the online world. They are invincible in virtual battles and are even called legendary. However, in the real world, the brother and sister are "otakus" who dare not even leave their homes and suffer from severe crowd phobia. One day, Sora and Shiro received a message from a strange boy and were summoned to a different world, where humans, elves, Flügels, and Ex-Machinas live on the same land. There is no war or violence here, but only endless games one after another. All interests and rights are determined by the results of the game. The weak human race retreated step by step in the game and finally lived on the last piece of pure land. Can Sora and Shiro's arrival change this tragic situation?