Origin of the Dark Angel (Part 1)

Issei Hyoudou, a young man who holds the title of the Red Dragon Emperor, realizes that he has been used as a tool to free Rias from her arranged marriage. He decides to leave the Rias Gremory peerage and find something or someone that can change his life into one filled with love and happiness. Nobody knows that he has already found his one true love...... The Dark Angel. Not only did he find love, but he also found his new power, which he will be able to protect his lover and everyone else he loves from harm in the future.

[Note: I don't own Highschool DxD nor the characters from the DxD. It also contain mature content in this story.]