Well, it helps to see the movie at least twice. From what I remember when I saw it, Tetsuo and all the kids are dead. Tetsuo's powers went out of control, and the other kids used their power to save Kanida and the girl. Akira came and once again caused the destruction of Tokyo, so the only people left alive were Kanida, the girl, and the military guy (general?). Anyone who remembers more clearly, feel free to elaborate.