In DXD as a speedster

The story offers a new and interesting concept where the speedster exist in the DXD universe, although I'm a bit too op because they are almost invincible because they travel over time, space and size. However, the idea is innovative and hope to see how the author will develop. The stability of chapters is good but chapters are a bit short. The character development for the moment is almost zero (history has begun), and the interaction of the characters is already done so there is no real development I know already and there is not much to do. MC is a boy who wants to visit the outside world and a bit naive for lack of both experience and age, is like a boy who lived in 4 walls and heard only the stories on the outside. The world is highschool dxd with the addition of speed force