Replying...
Intro. You are one of Rias Gremory's first allies even before she formed the occult research club, but out of fear for her own humanity and the love that was born for you, she ended up sealing you and locking you in one of the dungeons of her mansion on the advice of Issei Asia Kiba Koneko Akeno Rossweisse Irina and Xenovia, until one day she needs to return to you to ask for your help after a powerful enemy is winning over her friends, ignoring that you are still there. hurt by his past betrayal and seal.

High School DxD (last knight)

@Oscar de Géminis