ABO settings. In this world where many races live together, there is a mysterious forest called the God's Hidden Forest, which is said to be the residence of God. Ling Yi, who wanted to change the tragic fate of being a half-beast O, met Vita, the self-proclaimed Elf King, in the castle deep in the Forest of Gods. Vita said that he can realize Ling Yi's wish and has the ability to change his gender and race, but Ling Yi needs to make a bet with him. If Ling Yi wins, he can realize his wish, and if he loses, he will become one of his many pets.