One day, after losing his life in a sudden accident, he is reincarnated into another world as Rain, the eldest son of the provincial noble House Proudroad. Upon his reincarnation, he was gifted a natural aptitude for magic, granting him the ability to use “Synthesis Magic”—the power to combine different magical attributes. Rain attempts to use this talent to establish a comfortable life in his family’s territory, but…?! Together with Shiro, a baby Fenrir he found in the forest during his magic training, he aims for a cozy and comfortable “slow life”!!