Shokei Flag no Akuyaku Kizoku ni Tensei shita ga, Shinitakunai node Yami Mahou wo Kiwamete Heroine-tachi wo Sukuimasu

I've been reincarnated as the hated aristocrat Diabolo in a game world, but the fate closing in on me is brutal retribution at the hands of the heroines... To atone for and save the heroines whom Diabolo once disgraced, I will overcome harsh difficulties and obtain the ultimate power!

(Source: Square Enix, translated)