@Lyohzeed The plot just gets crazier and crazier Way down the line. It gets so absurd that it's hard to describe.
The Saintess gets upgraded and becomes a summon like the holy sword two. There are levels above SSS like MAX then Z, ZZ and ZZZ. When he finally gets back to Earth, it's being invaded by androids and the heroes have their powers and are fighting against them. There's this whole convoluted plot where these guys are fighting against the "gods" or isekai world managers. He dies after getting suicide bombed by one of those guys, gets reincarnated as a baby in the isekai world with all his powers, becomes an emperor, met and killed the nerdy hero who was too busy fucking an elf than fixing the world then restart once more in the isekai world since he wasn't techniquely a hero in the instance where he got reborn as a baby. There's a lot I'm just smoothing over but it gets stupid and crazy in an entertaining way.