I'm a Noble on the Brink of Ruin, So I Might as Well Try Mastering Magic

One second he's a drunk middle-aged commoner, and the next he's Liam Hamilton, the son of a noble house on the brink of ruin! At least he can finally try learning magic... But will it be enough to save him from the shadow looming over his family?

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没落予定の貴族だけど、暇だったから魔法を極めてみた（ライトノベル）