ある日突然、未知のウイルスにより世界は滅びた。

Suddenly one day, the world was destroyed by an unknown virus.

生き残ったのは子供だけ。

Only children survived.

そして、その子供たちは地の底より現れた、吸血鬼たちに支配された。

And those children were ruled by vampires who appeared from the abyss.

百夜優一郎は、家族同然の絆を持つ百夜ミカエラら孤児たちと、

Yuichiro Hyakuya was surviving by giving blood to vampires,

吸血鬼に血を捧げることで生きていた。

together with Mikaela Hyakuya and other orphans who shared bond similar to a real family.

家畜同然の扱いに耐えかねた優一郎は、ミカエラや幼い孤児たちと共に、

Yuichiro could not endure being treated like livestock anymore, and tried to escape

外の世界へと脱出を図るが……。

to the outside world along with Mikaela and the young orphans.

時は４年後。

Four years later.

百夜優一郎は日本帝鬼軍の吸血鬼殲滅部隊「月鬼ノ組」に入隊。

Yuichiro has enlisted in the "The Moon Demon Company", a Vampire Extermination Unit of the Japanese

恐るべき吸血鬼たちとの戦いに、その身を投じていく…!!

Imperial Demon Army. He devotes himself into fighting against formidable vampires!!