The chick appraiser I expelled from the party apparently became SSS rank and is coming back for revenge.

Raoul, who possesses the skill to determine the sex of chicks, successfully infiltrates the hero party of his dreams. However, he is expelled from the party by the hero, who makes a valid point: "Why is a chick appraiser mixed in with a hero party?" Reluctantly returning to town, Raoul resolves to take revenge on that hero, trains himself, and finally reaches the SSS-rank occupation. This is not the revenge tale of that man—but rather, the story of the hero party that is about to face his revenge right now.