Touji Nanase, the protagonist, is constantly harassed by debt collectors and bullied at his black company job. One day, he is sucked into a dungeon and attacked by monsters! On the brink of death, he awakens a legendary skill from an item he acquires: the ability to turn the monsters he kills into a sword, known as "Magic Sword User."

Despite his gruesome appearance and brutal nature that cause people to treat him as a monster, Touji begins his journey of revenge, targeting those who have tormented him. This is a dark fantasy of revenge and rampaging power, where he fights his way through a world of treachery and betrayal!

A story of vengeance and redemption in a thrilling, dark fantasy world!