Diablo in Highschool DxD DIHD

A sociopathic loner who had lost everything in his life, gained another chance. He would not let this new start go to waste...He would not let anything get stripped from his life again, he would gain power......power to eradicate all who stood infront him. This was the story of a man, who became the apex of the world......or did he?
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He won't be super OP but will be very strong (and the strongest too in the future but that's like way at the end) but not strong from the beginning though. So its basically a progression from weak to strong, and by strong I mean very strong
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I don't own High School DxD or even the cover photo
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I will not be always able to post it daily, so it would be whenever I have free time