The Fallen God

OP! Male Reader x Highschool DxD.
You were once a part of Rias Peerage and were the most loyal one. But the only problem was..... you weren't the strongest in the group at that time. Rias sensed one of the most powerful Sacred Gears inside of you and tried everything to bring it out. She didn't knew that you already unlocked it though. You had one of the most powerful dragon in you. But she didn't knew it and thought of you as a weakling. So she waited for the right moment to kill you. But before killing you, she somehow stole your dragon and your Sacred Gear. Then she killed you........ or so she thought. A few months later a mysterious man in armor appeared and killed devils angels and fallen angels brutaly. He claims to be the 'True God'. That person called himself 'Savitar'. That person....... is Y/N........ and he will have his vengence. They will all feel the wrath of a true god. Now then.......... let's go for a run.
Disclaimer: I don't own anything. Just this story.