One day, Diddy Kong is watching television. He sees a commercial for the Luigi-Minis, and quickly rushes to the factory to get some. Sadly, none are left, and after the Toad workers mock him, Diddy goes ballistic. He snatches the Luigi-Minis and the Toad workers, forcing Luigi to go after him.
After a long adventure, Luigi confronts Diddy in Big Ape City. Diddy breaks down in tears, and Luigi forgives him for his bad deeds. The two go home to celebrate together.