1. Lea met Ventus and their hearts clicked. 2. Lea becomes heartless, Axel is created. 3. Ventus's heart enters Sora. 4. Sora becomes heartless, Roxas is created in Ventus's image. 5. Roxas inherits all of Ventus's heart's contents (because he is connected to Sora, who is still alive even after becoming heartless and producing a nobody. A first in this phenomenon.) 6. Roxas and Axel become fast friends...