処刑フラグの悪役貴族に転生したが、死にたくないので闇魔法を極めてヒロインたちを救います

I’ve been reincarnated as the hated aristocrat Diabolo in a game world, but the fate closing in on me is a brutal retaliation from the heroines... To atone for and save the heroines whom Diabolo once disgraced, I will overcome harsh difficulties and obtain the strongest power!