Forbidden Love (Diabolik Lovers)

What well happen if the one and only Karlheinz, the vampire king has a secret family hidden in Japan. The Sakamori Kids.

Vampires? Yes. All four of them.

Full blood? No. Their just the same as the Mukami brothers.

Full blood siblings? Yes and no. Just like the Sakamaki brothers.

How many? Four. Three sons and one daughter. The only daughter.

And there is when the story starts. 6_6...9_9...6_6...9_9... okay no XD