Xiao Hei turns into an egg in a village and is taken in by a mother hen who becomes his adoptive mother. To escape a devastating chicken plague, Xiao Hei and his family bravely venture into the Secret Realm of All Spirits, where he unexpectedly discovers that he is the biological son of the Demon King and a goddess from the Immortal Realm. To rescue his adoptive mother, who has been sealed away, he has no choice but to travel to the Immortal Realm and seek help from his birth mother. Through arduous cultivation, he eventually becomes the one and only, most powerful hybrid of demon and immortal. He successfully rescues his adoptive mother, Aunt Hua, and resolves the conflict between the two realms. Yet, even when the supreme ancient True God position is within his grasp, he wants nothing to do with his Demon King father or goddess mother. All he wants is to take his adoptive hen mother and his brothers and sisters somewhere safe, where he can live freely and peacefully as an ordinary little chicken.