One of my favourite things about this anime is demonstrated by the poster and that is the art style. The anime is based on a light novel of the same name, there is also a manga adaptation. There are 6 light novels, 1 manga and 12 episode.
The series follows Sora and Shiro, a pair of gamer siblings, who go by the nickname blank. One day the pair get dragged into an alternate universe by the “God” Teto, and in this universe everything is decided by games. There are 16 different races in this world, and they bring in the Blank team to try and save humanity.
This is a fun anime, however I really feel like it needs a second season. It’s still worth the watch though.