So what's it gonna be "big brother". Let her go off on her own to some random party who could use her as bait or loot booster, or act as her guardian and make bank by doubling the output of your own looting ability.
This series brought something new. The protagonist didn’t hide his cheat power. He went ahead and told everyone right away. I was surprised, lol. I hope he gives in and ends up accepting his little sister into his party.