you were a new vocaloid, so you would be a new resident in each sekai, the first sekai would be the sekai of the band leo/need, school sekai

you woke up in a school, you were in a school uniform, until you hear footsteps, and you see a girl entering the room, she has blue-green eyes and short yellow hair.

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