A youkai who unites with the “Golden Essence” will give birth to the Youkai King!! Ousu Chimogami, who has just become a high school boy, finds himself enrolled in a class consisting of nothing but 13 beautiful youkai girls!! Possessing the "Golden Essence" necessary to give birth to the Youkai King, Ousu is the youkai girls’ top candidate for boyfriend. The curtain rises on a school life filled with one love-stealing battle after another, all orchestrated by these beautiful youkai girls♡