It's the thing from Haruhi, he can go back but not forward. But whatever happened in between is important so he need to preserve as much he could so there won't be dupes of him. Eg∶ if the village wasn't destroyed, that timelime‘s him won't go to the village and go back in time. Whether it is the original or altered timeline from start, we don't know. Does it even matter？More importantly, strip the big mommy.
Big, soft pillowy mommy
Ahh, yes, it's very similar to how Kyon fixed the time paradox in Tanabata + Haruhi Dissapearance.
Sekai's efforts to fix the past without changing history have paid off. The Fixed timeline would be clearer if observed via Furry's POV.
A Year ago, Furry met with a mysterious young man (Sekai) who claimed to have come from the future and warned about the village's destruction.
Future Sekai prevented the Aksho murder, caught the slime, Foiled Discius's plan, made Lucy destroy the VIllage, let Furry get caught by the raiders (who thought they were the ones who destroyed the Village), and then made the villagers (minus Furry and Esther) hide inside a cave for a year. Furry and Esther don't remember this because their memory was overwritten.
(During this time, instead of returning back to the future, Sekai went to the Magic guild and was imprisoned in Slow magic)
A year later, the imprisoned Furry met with Sekai, venturing together. They then reached the now destroyed Elven village, reunited with Esther, and Sekai went inside Shinra's dungeon (This Sekai doing some past event arc and ended up connected with last paragraph). After a while, Sekai still not come out from Shnra's dungeon, then suddenly Lucy and other Elven villager comes out of a cave.
After learning about Sekai getting caught by Veradonna, Furry, Nia, asked Beltree princess to save imprisoned Sekai from Veradonna.
Thus, the timeline is fixed
