Adventure Across The Omniverse

This is the year 5000, they exhausted all the resources of the world during the project of immortality Called Project Fountain Of Youth that our MC was a succesful expirement. the immortality expirement worked on MC in 2025, he was an average NEET, he always dreamed of visiting anime worlds, but after the expirement, He was trained as a weapon for the government. He slaughtered multiple officials when they brought him to demonstrate their training program. He escaped and hid till the year 2800 when he was found yet again, he decided not to killcthis time and fled. Then the year 4986 rolled around. A great war between every nation caused MC to meet with a long lost relative he thought died during the Fountain Of Youth Expirment. They had a long battle with each other, killing almost all the soldiers that weren't already murdered. The MC tells a tale, the tale of three brothers. They both wanted to being back their mothers but MC was the smart one, like the third brother, while his relative was stupid and blinded by love, like the second brother. The MC goes down and gets reincarnated by an R.O.B