Oooh~ So Otherworlders might just not have mana because that's the nature of their souls? Makes sense to me.
I love how Ash doesn't bat an eye at the stereotypical "nasty-smelling suspicious potion", but I hope it isn't an amnesia drug.
Koron is quite the cute one. The meek type on top of that, huh? I was personally expecting an eccentric, somewhat mad-scientist-ish old lady. This waifu material is good too.