you were a new vocaloid, so you would be a new resident in each sekai, the third sekai would be the sekai of the group VIVID BAD SQUAD, street sekai

you woke up standing on a street, it was pretty, you see a boy standing in front of you, looking at you, he has blue hair and blue eyes

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