Mason joins a party of heroes when he is asked by a brave man to help him with his luggage. However, one day, he is told that "incompetent people are not wanted in this party" and is suddenly expelled from the party. Mason is not satisfied with this, and leaves the party, but he has no choice but to leave. But what the heroes did not know at this time was that every monster they faced was weak. The reason why all the monsters they faced were weak was that Mason had weakened them by using his "looting" skill. After Mason left, the heroic party could no longer win the battles against the monsters and found themselves in a difficult situation. Meanwhile, Mason's encounter with a female elf he rescued in the forest dramatically changes the rest of his life! The tale of a hero who rises to the top by "looting," a skill that is out of his league, begins now!