Books in the King's Proposal (Light Novel) series

"When Anviet saves a little girl named Surya from a gang of stray mages, the last thing he expects is for her to call him Papa. Though Anviet swears up and down that he doesn't have any children, news of a Garden instructor with an illegitimate daughter starts to spread like wildfire. Amid all this commotion, Mushiki wakes up to find that Saika has been separated from his body, even though the two of them are supposed to be fused together. However, they don't have long to savor this stroke of good fortune before cities across the world begin to disappear without a trace. As Mushiki and company investigate, it soon becomes clear that Surya, Saika's separation, and the disasters sweeping the globe are all connected somehow"--