you were a new vocaloid, so you would be a new resident in each sekai, the fourth sekai would be the sekai of the group WONDERLANS X SHOWTIME, Wonderland sekai

you woke up on a amusement park, it was cool, suddenly, you see a girl standing in front of you, she has long pink hair and blue eyes, she is...sleeping? But After some time, she suddenly wakes up.

– "Ah! Oh... Sorry, you must be the new resident, no? Come here, i will show you the others..." – she says, grabbing your arm.