One month has past since the Rainbooms first ventured into the gamingverse of Sunset's GameStation. They decide to relax for a while, but a mischievous rabbit-like creature is causing havoc out at Sweet Apple Acres.

It turns out that the rabbit is actually a mysterious messenger and the girls find themselves back inside the GameStation once again. This time, they'll travel to a world filled with giant mushrooms, a kind-hearted princess, a turtle-like tyrant, and two Italian plumbers that are brothers.

Unbeknownst to them, however, they will have to team up with three foes that they have faced before in a showdown of epic proportions.