In a world where alpha, the superior sex, rules, the life of an omega, destined to give birth to an alpha, depends on whether or not he or she can have an alpha child. Saimon, an Omega, who has been neglected by the Hanabusa family, a married family of a conglomerate, because he cannot bear children, pretends that an Omega boy is an Alpha, and makes him his target for the head of the Hanabusa family...?　 The battle begins for the lowest rank in the gender-based society...!