When Ripple Star is invaded by Zero-Two, Kirby and the GSA must help Ribbon restore the broken Great Crystal and free the planet from its corruption. On the way, Kirby must also face the dark forces seeking vengeance against him as well as finding his position in the world. Can Kirby find the strength to save the world once again? And can he find this thing known as... love?

In the last tournament, Luigi used the Negative Zone as his Final Smash and it was utterly powerful. Everyobdy pretty much feared it in fact. This time, however, in preparation for the new and upcoming tournament, it seems that he's unable to use it at all. How come? And did Luigi really want to keep it in the first place?

As protectors of not just the Mushroom Kingdom but the entire world, Mario and Luigi are always being tested in some way. In the past with their baby selves, they need to save the world once again but the Star Gate is making this difficult forcing the brothers to consider themselves and how they work together as a team. For the world's fate is always in their hands...