One day, after losing his life in an unexpected accident, he is reincarnated into another world as Rain, the eldest son of the Proud Lord family, a local noble family. Having received a natural talent for magic from God when he was reincarnated, Rain, who can now use "synthetic magic" that combines attributes, tries to use this talent to live a comfortable life in his territory, but...!? Aim for a comfortable slow life with Fenrir's young Shiro, whom I picked up in the forest during my magical training!! (Source: Futabasha, translated)