I believe the reasoning was "to find a way to restore her lost lifespan".So it was fine for those 3 to stick around but the girl had to leave why?
it's annoying as hell. Real big japanese nationalist vibes from this manga despite there being no reason for it. Imagine one day we're reading and just see "Sino war crimes never happened"I see that it's another manga with borderline fetishization of katanas and rice. Seriously, I love rice too, but they're pretty much worshiping it to an unhealthy degree.