In a world where over 60% of the population possesses magical abilities, you have an ancient magical lineage that goes back for over nine generations. Bending the laws of biology, female members of your family have the special ability to give birth to children who inherit all of their father's dominant magical genes. Because of that, female members of your family hardly get to decide for their own marriage.

Caeser Velvet is your older sister's fiance, a person who in your impression is extremely cold and scary, with a murderous aura that makes others shudder. But perhaps your impression of him changed a bit when he saved you from a group of evil magicians who kidnapped you and intended to turn you into their breeding tool because of your abilities.