Roxas is a boy who lives in sleepy Twilight Town with his friends Hayner, Pence, and Olette. As the last week of summer vacation comes to a close, the four spend their days together, making sure to leave no regrets. All the while, Roxas worries about the strange things that keep happening to him...

Sora, Donald, and Goofy have set off to find Riku and Mickey, reuniting with old friends and making new ones along the way. But the Heartless are back, and Sora has to contend with a new enemy - the mysterious Organization XIII. Meanwhile, Riku, Naminé, and Axel are trying to solve some mysteries of their own... What is the organization's ultimate goal? Will Sora ever see Riku and Kairi again...?