No Game No Life (2014)

S1E2 Challenger

After Tet casts them into a strange new realm, Sora and Shiro discover that warfare has been outlawed entirely. Instead, all conflicts are settled through games, governed by the sacred "Ten Pledges" that Tet himself created. The siblings land in the nation of humanity, which holds the unfortunate distinction of being the weakest among the sixteen races inhabiting this world. With their unmatched strategic minds, they must now navigate a reality where wit, cunning, and gaming prowess are the only currencies that matter.