I Don't Have the Qualities to Be a Saint, so I Decided to Aim to Be the Last Boss!

The Divine Law Knights offer up what is precious to God and challenge monsters with the power of "oaths." A young boy named Luca lost everything when his hometown was burned down, and longed to join the Knights. During the oath ceremony, a monster suddenly appeared and attacked Luca, and he was driven to the brink of death without being able to offer anything. At that moment, a sealed, forbidden flame was born within the boy. Will this vow and flame bring hope to the Knights, or will it become a new disaster? A full-scale dark battle fantasy begins as the forbidden flame burns! (Source: Studio Zoon, translated)