Living in an orphanage, Daath and his younger sister Bella are omegas, which means they are at risk of being forced into marriage after their first heat, unlike the other children. Daath is determined to keep his family together and is appalled to discover that the priest in charge has been selling off omegas instead of arranging marriages. When Bella goes into heat unexpectedly, the situation worsens, and they are only saved by the mysterious alpha beast-man Juda.