Blue Blood Vampire

Blue Blood Vampire summary:

Azure, the founding father of vampires who has lived since time immemorial, is challenged to a fight by Shuuya, a vampire hunter who makes no effort to conceal his hostility. Interest piqued, Azure proposes a game. Should Shuuya come to love Azure by the time the red spider lilies wither, he shall become a bride. Should Shuuya’s feelings remain unchanged, his wish shall be granted. What will become of Shuuya, fiancé to the strongest vampire...!?