VAMPIRE MASTER Dark Crimson

A long-standing conflict exists between humans, known as Crimsons, and a dominant enemy called Clients, who view themselves as deities. In the late twentieth century, Crimsons remain under the Clients' control, with the wealthy offering human sacrifices for protection. Shion, a vampire who is part Crimson and part Client, fights against the Clients alongside his companion, Rain. After encountering Helen, a girl whose family was killed by the Clients, Shion forms a bond with her through a blood oath and incorporates her into his group.