Itsuki, who's deemed as unknown gender and is expected to be a beta, lost his last family member (Grandmother) when he was only 15 years old. Since then he tried his hardest and worked hard for himself. He was recruited into a Prominent Alpha family as a house servant due to his unknown gender. Despite his enthusiasm working there, he was met with a problem—one of his masters, the younger brother Kaisei despise all genders and is somewhat very crude and hostile while the older brother, Ujou, is very discriminating towards omega alike. But this isn't the only obstacle that Itsuki have to face….