While searching for the source of a draft in the attic of Princess Peach's Castle, Luigi and a Toad discovered the book on the bookshelf. Startled by a Scaredy Rat, Luigi knocked the book down, causing it to open and release various Paper characters into the world. Mario and Luigi teamed up with Paper Mario to track down the various Paper Toads that had been released, while Bowser united with Paper Bowser.