My Noble Family Is Headed for Ruin, so I May as Well Study Magic in My Free TimeBotsuraku Yotei no Kizoku dakedo, Hima datta kara Mahou wo Kiwamete Mita; 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; I'm a Noble on the Brink of Ruin, So I Might as Well Try Mastering Magic

A man who was enjoying an evening drink got transferred to the body of Liam, the fifth son of a nobleman from another world."I spent easy days practicing the magic I had longed for, and learned not only attribute magic, but also how to summon spirits, obtain powerful familiars, and ended up mastering even the most difficult magic!"He became an adventurer aiming for independence from his parents' house, which was scheduled to fall, and before he knew it, he became a higher-ranking aristocrat rather than one of the best magicians in the world.