10 years prior to Kingdom Hearts 1, this game tells the story of 3 keyblade heroes, Terra, Aqua, and Ventus. As Terra and Aqua go to their qualification exams, 2 master keybladers watch. One of intentions of making his pupils purified with the teachings of light, Master Erauqs. While sinisterly planning a great scheme, Master Xehanort, extracts the darkness within Terra. Right next to him, is his pupil, a mysterious person in a red/black armor and black helmet watches Ventus. What could this person possibly be interested within Ventus. And why does Ventus have a striking resemblance to Roxas....?