Vampire Slayers(Tanjiro x Kanao x Sophia)

Tanjiro came back home to only see his family dead. Only Nezuko was the only family member he had left. Tanjiro quickly hurry down the mountain to save his sister from death. That's when he encounter someone named Krul Tepes who is the Vampire Queen. Seeing his sister dying, he beg the vampire to save her from death. She agree, but only in one condition... he and Nezuko must become her servants, and once they become vampires, there's no turning back. Will Tanjiro accepts this offer or will he deny it. Only one way to find, and it's by reading it.