Yoshida, who worked at a black company, dies in an accident and learns that he cannot be reborn in the present world due to a mistake during the reincarnation process. With the proposal from a god, Yoshida is reborn in a different world, accompanied reluctantly by the angel who made the mistake. They are born as twin siblings in a world of swords and magic. Years later, Yoshida begins his training under the guidance of his sister angel to lead a fulfilling life. The talent given to him by the god gradually but surely blossoms. Meanwhile, his sister, who has decided to enjoy the present world, plans to train her brother to live a parasitic life without any worries. Whether he becomes an adventurer or the third-generation innkeeper, Yoshida's second life with his work-averse sister begins.