The last sidestory(?) was a little confusing, but I think I can imagine what may have happened, maybe. Little 8 year old Nine wanted to meet someone warm, as he said somewhere here. He likely made that wish on a full moon, and hence it was granted - on the moment wherein there is no more danger nor crisis, and their feelings for each other are already clear and determined. If it happened earlier, Melissa might not have been able to give him all that much care due to dealing with crisis after crisis, not to mention how it might impact future Nine's relationship with Melissa. So, he likely replaced older Nine for a moment, until the magic wore off and he went back to his world. After that, little Nine was determined to meet her again - perhaps in a different timeframe, in a path that leads to a similar future? This is what confuses me. I don't think Melissa had to wait for this Nine to grow up, as old as she is, for them to reunite, when they were already together. If it's an alternate story, universe, and timeline, then we can't guarantee if it's the same "Melissa" that this Nine will meet. So, maybe, little Nine reunited with another version of this reincarnated Melissa, outside of the usual story too, but in a different path? And then, in the previous world, adult nine must've simply thought of it as a strange dream, probably to be told that a younger him had played with everyone in there?
The last sidestory(?) was a little confusing, but I think I can imagine what may have happened, maybe. Little 8 year old Nine wanted to meet someone warm, as he said somewhere here. He likely made that wish on a full moon, and hence it was granted - on the moment wherein there is no more danger nor crisis, and their feelings for each other are already clear and determined. If it happened earlier, Melissa might not have been able to give him all that much care due to dealing with crisis after crisis, not to mention how it might impact future Nine's relationship with Melissa. So, he likely replaced older Nine for a moment, until the magic wore off and he went back to his world. After that, little Nine was determined to meet her again - perhaps in a different timeframe, in a path that leads to a similar future? This is what confuses me. I don't think Melissa had to wait for this Nine to grow up, as old as she is, for them to reunite, when they were already together.
If it's an alternate story, universe, and timeline, then we can't guarantee if it's the same "Melissa" that this Nine will meet. So, maybe, little Nine reunited with another version of this reincarnated Melissa, outside of the usual story too, but in a different path? And then, in the previous world, adult nine must've simply thought of it as a strange dream, probably to be told that a younger him had played with everyone in there?