Vengeful persona user x highschool dxd (on hold)

Basically you were a famous detective prince but you have a dark side you solved a case one day and you got killed but rias and her peerage saved you then you realize that they only wanted you for your power so when rias asked you to meet her somewhere she takes you piece and when you about to die u awake up in a strange place called the velvet room what will you do when you seek vengeance with your new power?

Disclaimer I don't own persona, highschool dxd, it the pictures that's in the story