This story is based on the thorie that somewhere exist a alternative dimension for everything which happen.
Kaworu and Shinji are not became Children ’cause the Angel never attacked the humanity and that’s why they are spared from their cruel fate in which they had to fight and had to go trough pain.
So in this dimension they live a normal school life, but not quite ’cause Kaworu recalls his past with the EVAs and Angels.
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