Demon Eyesからやって来た超能力を持つバンパイアの種族であるBreathersと戦うデパートメント18は、一方は人間との平和的な共存を望み、もう一方は人類を根絶やしにするまで喰らいつくす事を望んでいるバンパイア派閥同士の戦いに巻き込まれてしまう。
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Department 18 takes on the Breathers, the species of psychic-sexual vampires from Demon Eyes, and gets caught between warring factions—one wants to coexist peacefully with humans and the other wants only to feed off them until humanity is wiped out.