故事发生在遥远的未来，一种神秘的病毒侵袭了地球，十三岁以上的人类全部灭绝，可是，对于那些幸存下来的孩子们来说，活着却并不意味着幸运，横空出世的吸血鬼一族成为了地球上的统治者，而这些孩子们则作为它们的口粮被“饲养”起来。优一郎（入野自由 配音）和米伽尔（小野贤章 配音）不愿意向命运低头，为了反抗，优一郎加入了日本帝鬼军，成为了月鬼组的一员。在那里，优一郎结识了特立独行的柊筱娅（早见沙织 配音）、善良软弱的早乙女与一（冈本信彦 配音）、温文尔雅的君月士方（石川界人 配音）和大大咧咧的三宫三叶（井口裕香 配音），五人成为了生死与共的战友。
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