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For centuries, the deadly arts have been perfected by Masters, and Five Great Families hold the greatest power and influence. Hikaru Gero, an heir to the Gero family, lives in the underworld as an elite assassin. When his sister is pressured to produce an heir, Hikaru asks Mei Kinosaki, a brilliant marriage swindler, to find him a bride. The most challenging mission of his life begins!

Rikuo Nura, is 3 parts human and a quarter Demon, lives in a house of spirits with his grandfather, The current clan head of the Nura youkai. Rikuo is set to be the next clan head, despite the fact he dislikes his demon side. He soon come to terms with his demon blood and decides to take his position as young master of the Nura house. However there are those who will certainly not allow it to be easy.

Gon, a young boy who lives on Whale Island, dreams of becoming a Hunter like his father, who left when Gon was still young.

In the seaside city of Riverfield stands Decelis Academy, home to seven mysterious boys sharing the same secret: They're vampires, hiding their murky pasts. When Sooha, a female student who hates vampires, transfers to the academy, the boys find themselves irresistibly drawn to her. As strange events shake the city, old sins and buried secrets resurface, and their world begins to fracture.