Rude, a magician belonging to an S-rank party, is expelled from the party for selfish reasons by the hero, Tran.Betrayed by his companions and heartbroken, Rude abandons the city he has been staying in, and sets out on a journey to the neighboring Roland Empire in search of a new life.On the way, Rude fights off a band of thieves attacking a slave trading caravan, but suddenly the beast girl who was supposed to be free asks him, "Please... I want you to be my master!"...The strongest heroic fantasy begins as the strongest magician, who was abandoned by his companions, becomes unrivaled with his new companions!