I've never understood which is the proper way to say this game title. The meaning changes depending on where you put the stress:
The World Ends WITH You
-suggests the world is ending alongside you. As you are "ending" so does the world. Stressing "with" ties your meaning with the "world".
The World Ends With YOU
-suggests that "you" are the final event at the end of the world, you "are" the end. Stressing "you" ties the meaning of the world to "you".
So which way is it?