who is the main character?
Sora and Shiro.
No Game No Life
Sora and Shiro are two hikikomori step-siblings who are known in the online gaming world as Blank, an undefeated group of gamers. 
where does no game no life anime end UNANSWERABLE when was this movie released? It is also a T.V. series that premiered between April and July 2014. what genre is it? A fantasy setting with battles.
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No Game No Life [SEP] Plot
Sora and Shiro are two hikikomori step-siblings who are known in the online gaming world as Blank, an undefeated group of gamers. One day, they are challenged to a game of chess by Tet, a god from another reality. The two are victorious and are offered to live in a world that centers around games. They accept, believing it to be a joke, and are summoned to a reality known as There, a spell known as the Ten Pledges prevents the citizens of Disboard from inflicting harm on one another, forcing them to resolve their differences by gambling with games whose rules and rewards are magically enforced.