No Game No Life, Vol. 5 (Light Novel)

In the world of Disboard, everything is decided by games. And after rising to rule as the king and queen of the remnants of Disboard''s humans, gamer siblings Sora and Shiro bail out of an unwinnable romance game against the races of Dhampir and Siren. To uncover the true strategy to beat it, they head for the home of the angelic Flügel: the midair city of Avant Heim. But the Flügel are a hideously powerful race, created specifically to kill gods--will things really go as planned?