Reborn As Accelerator With Game System [Highschool DxD X Accelerator Reader]

A teenager boy die in car crash because being push by his bully to the road.
He start thinking this life is unfair until a screen poop out and ask...

[Do you think this life is unfair?]

Y/n: Yes...

[Do you want to become stronger?]

Y/n: Yes...

[And will you accept this Nano Game System in your way to become the stronger?]

Y/n: YES!!!

[Congratulations! You have being choosed as the Nano Gamer]

He then being send to Highschool DxD but not just that, he also is Accelerator.
The strongest Esper in [A Certain Scientific Accelerator].
He also get a cool Item as his Weapon or Sacred Gear.
He now have set out his goal.
He will become the Strongest one and make everything kneel upon him.