PaRappa is in trouble when he has two promises he wanted to keep. He wanted to go with Sunny and Katy to Sister Gon's garage sale, while at the same time, he wanted to play basketball with P.J. and his new friend Matt. A new girl named Paula comes by and stirs up some trouble with Katy. While all of this madness is happening, a bunny named Gaster is causing even more chaos.