Vadramentis Ledo

The World tragically ends on March 9th, 2030. the last survivor goes through a dungeon that was in the ruins of the Japanese prime minister's office. the last survivor finds a ????R class artifact. he uses it to turn back time and keep his status. he doesn't regress but goes back in time and creates a new timeline. now a future man, the sole survivor of the great calamity. he will try to change the future. will he succeed or will fate play a twisted joke on him once again?