没落予定の貴族だけど、暇だったから魔法を極めてみた＠COMIC

Liam Hamilton wakes up as the youngest son of a noble house carrying the memories of a middle-aged commoner who spent his nights on cheap beer at the tavern, and nothing explains the swap. The upside is that a noble may study magic, which no peasant ever got to try. The catch is that the family he has landed in is sliding toward ruin and has to prove itself worthy of high society to survive. Liam turns out to have a real affinity for magic, and the house has nothing else to bet on. This manga adapts the light novel of the same name.