you were a new vocaloid, so you would be a new resident in each sekai, the second sekai would be the sekai of the group MORE MORE JUMP!, stage sekai

you woke up in a stage, there was so much people watching you, but, there was a boy walking over to you, he had blonde hair with a small ponytail and blue eyes.

– hi! You must be the new resident, right? I'm Kagamine Len, come with me, i'll show you the others! – she says, offering a hand to you.