The story tells the fantasy adventure story of a modern human, Sieg, who is reborn as a slave of a pig-headed man in a Western fantasy world. In an accident, Sieg traveled to the continent of Klein and took away a pig-headed peon. Relying on the evolutionary opportunities given by the system, he gradually looked for the possibility of changing his destiny from the bottom slave. During the hard work in the quarry, he protected the elf girl Irene with his wisdom and courage, and joined hands with her to escape from the cruel land of slavery. While escaping, Sieg discovered the difference between his soul and the body of the pig-headed man, and gained Eileen's trust. The two embarked on a new adventure deep in the forest, and Sieg's evolution has just begun.
