I find it rather confusing... it doesn't make any sense. The original series was fine, though, except that the characters remained unchanged throughout the story.
It was obvious that World 3 has Yukiteru, and its Yuno had not met him yet. But, let's discount that off - say, he didn't transfer to the same school after the destruction due to the timeline being altered heavily.
The story still suffered a severe lack of progress on its characters, and this sequel certainly isn't an end even for that. It's short, though, and attempts to do that (It'd be more fitting if Yuno then entered the second world... (Edit
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