The night of the Ponyville wedding, Bon Bon is contacted by an old associate, looking to draft her back. Reluctantly accepting, she returned to her former job of hunting monsters.

Or so it would seem.

Through false alarms of jaywalking and littering, life as a vigilante of Ponyville gets extremely boring. However, as a new threat is detected, something goes wrong. The hunters become the hunted, and a race against the clock to find the real culprits begins.

In a time where they cannot trust their own, who will guard the guards themselves?