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Ordinarily, humans won't evolve unless they drink the blood of a black blood. However, they can change humans by sucking their blood and turn theam into the same bloodline as the black blood. If they ignore that existance, the world will be ruined.
Takahiro Sakurai
Mochizuki Jirou (voice)
Omi Minami
Mochizuki Kotarou (voice)
Miyuki Sawashiro
Cassandra Jill Warlock (voice)
Ryoko Nagata
Katsuragi Mimiko (voice)