Demon Flowers

Plot

Long ago, when Japanese Gods descended upon humans, their mixed offspring inherited supernatural powers... And the name "Kuruizaki No Hana."

Now those of the Demon World are rising up to wipe out these offspring-led by the cool and confident assassin, Ushitora. He's worshipped as a deadly professional, but when he falls in love with such gifted boy, Masato, everything changes. Ushitora betrays his people, sacrificing himself to a life on the run, in order to care for Masato and a spirited orphan girl named Nao.

-via the back of Vol. 1