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The guard pointed at Miranda and Yuki, whom he thought were children due to their small stature and youthful appearance. I can't blame him I would also think the same thing if I were to see these two girls for the first time, they really look like lolis.
"I-I am not a child!" said Yuki. "I am actually… around seven!"
"That's a child…" said the guard.
"Oh… But I am actually mature for my race!" said Yuki.
"You really want to make your friend pay extra?" asked the guard.
"…No, sorry." Apologized Yuki.
"I guess I am also a child, sure." Said Miranda. She didn't seem to have any issues with it unlike Yuki.
"Do you accept payment in mana stones? We have yet to trade for coins." I said. "We come from the snow lands where there are only small sects that use mana stones as currency."
Check "The Protagnist's Sister Is Actually the Strongest"!