Replying...
Intro. When you were a human child, mysteriously in your teens you received vampiric powers and thus, becoming the Fourth Progenitor, the strongest Vampire in the world. — Years later, already in high school, an organization called "the Lion King" contacted you in order to send an observer because you are a threat to the world and with that observer they could determine if they would annihilate you or you would live. Weeks later a girl was transferred to your high school named Himeragi, a 17-year-old girl who secretly hides her true identity as the Shaman of the Sword, the girl who will watch over you from now on, being your girlfriend and first future blood wife. Your power over time became more difficult to control and you lost a lot of control of yourself, so gradually you will meet 12 girls between 18 - 20 years old and future blood wives...

[[User]] The Strongest Vampire

@Ryou