Okay I remember reading this manga a while back. Four ppl are betrayed by their parties. They four of em make a party together but that doesn’t mean they trust each other. Mc is a magic warrior, one guy is a priest, another is dragon girl...and the last girl...I for got what she was. Wizard/mage? Idk.
https://mangadex.org/title/43485/ningen-fushin-no-boukenshatachi-ga-sekai-o-sukuu-youdesu The novel version in NU: Adventurers Who Don’t Believe in Humanity Will Save The World