So to point out the changes between the WN and the manga.
-The aliens actually stay at his house due to his mother’s insistence.
-the driver had no animosity to her at all and I think Mio was with her.
-Mio was the sacrifice not the little sister.
-the family was rather friendly with him except hairy grandma.
-Mio’s power level was a secret to the family and Mc actually pointed out “hey wouldn’t a strong sacrifice be better than a weak one?” Which then made them switch the sacrifice off of Mio to the little sister.
-The mother was always respectful to Mc and never requested a dual as she already knew Mc was a godslayer.(during his fight with the angel girl Mc used divine level magic which the mother felt)