Apparently, Disillusioned Adventurers Will Save the World, Vol. 2 (light novel) - Luke Hutton, Susumu Kuroi, Shinta Fuji

Thanks to their similiar experiences of betrayal, Nick, Tiana, Zem, and Karan have formed their own adventurer’s party called Survivors to turn their lives around and—most importantly—finance their hobbies. Things are going well, as they have obtained a holy sword with multiple powers that can take on a human form! But then Nick bumps into his ex-girlfriend and is dragged into a duel with her adventurer’s party, the Iron Tiger Troop, whose members are all fraudsters. Will the Survivors be able to defeat them and expose their crimes?