This really reminds me of No Game No Life. The animation is much more polished and the story is good, but lacks the depth of No Game No Life. While not as good as No game No Life, it is nonetheless a fun TV-Show. You get some character investment, but some of the characters don't seem to work very well and the story, while more than acceptable, lacks any depth. If you want a fun TV-Series without too much thinking or emotional investment, this is the one to watch. There is no fan service so its safe for minors.
