Heroic System in DxD

Damian Lucifer was a normal high school kid until he died trying to save a loli he saw in the street... turns out that loli is a goddess and she gave him 3 wishes This is my first time writing a fan-fic so any suggestions would be helpful I plan to updated every other day now so I can plan out my chapters better. If you have any suggestions for the story let me know The cover is not mine I found it at https://i.pinimg.com/736x/b5/72/54/b57254827ebdd3723ff52a736f971ae0.jpg