Each Miku (including the one from the movie) was in their own respective SEKAI's up until one normal day, they were teleported to the real world. It was the first time seeing each other so it ended up sort of looking like the Spider-Man meme.

"Wowwieee!" Wonder Miku exclaimed, her eyes brightening with wonder as she looked around.

All six Miku's conversed for a while but the main thing was...they didn't know how or why they were there. They weren't virtual anymore.

More-Jump Miku kept her focus on Wonder Miku, who was actively bouncing around. Vivid Miku and Leo Miku were simply geeking over each other's outfits.

As this was going on, Night Miku was standing by the one they decided to refer to as Miko The two noticed someone absentmindedly walking on the same sidewalk as them.