Thanks for the spoilers. Contrary to popular opinion on this site, I too like the manga ending and overall buildup a lot more than the wn you describe, yeah it is kind of a shame we won't see him grow even stronger but this felt more like a story of the world than a story just about the MC. 8/10...
Man i kept thinking throughout the manga run that something terrible happened in the future which kept being hinted by the weird future sequences where emi was always melancholic. Didn't expect such a wholesome end.