There are a few novels that might be considered similar. 'No Guns Life' is one. It has a unique world - setting where there are various battles and power struggles. Also, 'Grimgar of Fantasy and Ash' has a group of characters in a fantasy game - like world where they have to fight for survival and figure out the rules of the world, much like in the 'no game no life practical war game novel'.
Well, 'Sword Art Online' has a bit of a similar feel in terms of the game world concept. Although it's more focused on the action - adventure aspect within the game. 'The Rising of the Shield Hero' also shares some common elements as it has a main character who has to strategize and fight in a different world. These novels, like 'no game no life practical war game novel', all have elements of games and battles within their storylines.