It's clear that "money" is a strange and vague concept for them. If food there requires "money" and those coins are "money" then it should be fine, right?
Fine, take a seat over there.'Kay!IllogicalDon't worry about it, I'll pay for it.I brought money!When did our pancakes cost only ¥20?Split half with me.O-one pancake, please.Welcome... Oh, it's just you fairies.