Working seems Pointless After the Hero Labeled Me as a Coward and Kicked Me From His Party

A martial artist called Nicola, who specializes in techniques considered foul by many, is kicked from the Hero's party. Feeling betrayed, he vows to never work again. Nonetheless, Nicola's older sister, Satella, has other plans for him, appointing Nicola as the teacher of the class composed of the w