Kenzaki Shinichi is the leader of the Anti-Vector Task Squad. He's in charge of hunting down Vectors, humans that carry with them the deadly Resurrection Deficiency Syndrome, a disease that can keep someone from resurrecting when they die.
Chapter 41-48 were released as "Immortal Hounds" chapters but changed name with the release of chapter 49 to "Immortal Ridge" to serve as part of the sequel.
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