Kuromi is tough as nails! So going down a water slide should be easy as pie, right? Well, Hello Kitty and friends accidentally test out Kuromi's reputation by going to a waterpark for a day of fun in the sun. Things get scary as My Melody, Keroppi, Hello Kitty and Cinnamoroll want to go on the biggest slide in the park, "THE PLUNGE!" Will Kuromi face her fears and take the plunge? Or will her fear of heights ruin her tough reputation? Watch and find out!