“Every witch should be supervised by a magical girl.”

“But I’m a guy.”

“Guys get supervised too!”

“Hah!”

In this world, there exist monsters known as Calamities.

They are everywhere.

Fortunately, magical girls—champions of love and hope—fight to eliminate them.

After a cataclysmic Calamity incident known as Walpurgis Night came to an end, the witches chose to surrender and join humanity's side.

To prevent witches from abusing magic, humanity assigns apprentice magical girls to monitor witches and their descendants.

“I’ll be watching you forever..."