Blue Soul

A Dark Elf who's an ex-adventurer that became a mercenary after her boyfriend and her best friend died on a dragon slaying quest, a half-dwarf-half-high-elf that got her entire village wiped out by the a group of thieves, a master swordsman who vowed to kill her master and a former demon queen who feel inferior towards her brother who took her place to become the Demon King and is actually doing a great job at it banded together to form a mercenary group just to forget their pasts.
But as they continue to accept missions from the underground pub that they frequent to, the four girls continue their escape. Although they can't escape forever.