Three months have passed after Bowser's latest defeat, the Mario Bros. enjoy their vacation. However, they see Wario and Waluigi searching the treasure. Wario, however has accidentally pushed Diddy Kong, which Donkey Kong goes mad and attack them. Then Blue Toad and Yellow Toad appear and told the heroes: Blue Toad: Princess Peach is kidnapped! It's not Bowser, it's...It's Geno!!! The heroes don't know why Geno do a such a crime. Then they see Mallow run and accidectly to the heroes.