In the 21st century, humans finally came into contact with other intelligent life forms. However, this encounter was not a happy one. Monsters invading from the underworld have rendered most modern weapons ineffective, and the fate of humanity is hanging by a thread. But with the help of the Elf Environmental Treaty Agency, which is also suffering from the underworld, humanity has gained a chance to revive. That is the magical girl. The girl who gained powerful magic power, even though she was injured physically and mentally, still led humanity to victory and finally ended the war. However, this is only the beginning of a new war. International crime, indiscriminate terrorist attacks, civil war, disputes... The battle of the magical girl is not over -