I will finally be a partner in justice

Crossing over into a six year old Eiya Shiro with four wars under his belt and two parents still alive. Great! The next step is to stay away from the Fourth World War, refuse to be a partner in justice, and embrace great wealth by relying on a grasp of where the future is headed. But-. Destroy the evils of this world. Save the fading parallel world of Daigen. To smash the conspiracy of the Demon King. Saving Panhuman History My path, it seems, is getting further and further off the beaten path ...... PS: World War IV → Avalon's Court → Moi → FGO World War V →?