Legends, myths, magic... Humanity has finally had a chance encounter with a world that had been all but forgotten among all its scientific developments. However, this reunion is not a happy one. Monsters invading from the world of the dead render modern weapons useless, leaving the fate of humanity uncertain. But with help from the Otherworld Trade Agreement, mankind gains a possible means of returning from the brink of death in the form of magical girls. These girls, who have obtained immense magical powers, finally lead humanity to victory despite the many physical and emotional wounds it causes them. However, even this victory proves to be no more than the beginning of a new battle. With the rise of international crime, indiscriminate terrorism, civil war, and public unrest, the work of the magical girls is never done...

[Source: Crunchyroll]