So you get powers when you eat a devi... I mean peaches from that world.
So my guess is the intelligent enemy they encounter are probably humans who were constantly eating said peaches so someone is probably controlling everything kidnapping females force feeding them peaches until they become their pawns
@phil777 This chapter was published in Weekly Shonen Jump and not Shonen Jump+ where rest of the series is published. It was a summary/advertisement chapter so that people who don't buy SJ+ may pick it up if they find this manga interesting.