Storm Kicker has faced many challenges as part of her duties as bodyguard to Princess Twilight Sparkle, and despite some initial difficulties, she has managed to adjust quite nicely to her new role.

That is, until she she faces the most terrifying enemy of her entire career in the Royal Guard: an unholy prankster alliance between Sparkler Doo, her own younger sister, and Ponyville's premier prankster Rainbow Dash. Can Storm and her princess face this threat and escape with their dignity intact, or will they become the laughingstock of Ponyville and all Equestria?