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Javier and his group couldn't really reject my offer, especially because they didn't have anywhere to go. It was us or the outside world, only to be eaten by the monsters they can't defeat.
I had also saved their lives, so they were pretty grateful. And even more, people obviously will stick with the strong, they saw how we decimated the wolves like nothing, so they will obviously want to stick with us because it has the highest chances of survival compared to going out into the wild by themselves.
I could actually ask Kireina any time for her to easily brainwash them with her Illusion Magic and Charm, but I wanted to do things like a civilian for once. Although if they reject me then we'll brainwash them, I have no time to throw some idiots into the wild to get killed.
Check "The Protagnist's Sister Is Actually the Strongest"!