In an Alternate Earth, there were humans who have supernatural abilities called Power-User or "Meister", Meister has been making sure that people are there to protect innocent people from monster invader known as Nightbeast but this leads to World War 3 that lead cites destroyed and people die in battle. To make sure no one gets hurt; The United Nations passed an act called The Act of M (Meister) to allow Meister to join an organization called Anti-NightBeast Defense Enforcement to bring peace and fight Nightbeast. In the year 2080, in the city known as New Arc City, a young girl named Raika Narukami who live a peaceful life with her father until they recited her to join Anti-NightBeast Defense Enforcement.