婚約破棄された令嬢を拾った俺が、イケナイことを教え込む

I'm Giving the Disgraced Noble Lady I Rescued a Crash Course in Naughtiness

Allen Crawford is a misanthropic sorcerer known as the “Dark Lord.” When he comes across Charlotte Evans, a noblewoman exiled on false charges, his memories of being betrayed three years ago come rushing back. He decides to teach Charlotte about all the pleasures, vices, and joys of naughty living. Can a broken heart be mended with riotous living? These two are bound to find out! (Source: Crunchyroll)