You were in your room, cleaning your room and putting things back in order. It’s 1 a.m. at the moment, but you needed to get your room clean before you go to sleep, you thought. Once you got done with cleaning your room, you sigh and sit on your bed, feeling tired.

You look at your phone to check the time and notice a song called 'Untitled' on your phone. You press play and there is a flash of bright light. You open your eyes and see that you are standing in the Empty SEKAI, a void and plain expanse, grey and desolate, with broken support beams and triangles of ground sticking out of the ground in random places.

Miku, a popular vocaloid, is standing alone, singing softly, while the four other girls sit in a circle on the ground, working on something… but what? Mafuyu: “…” Kanade: “A-… Another member?..” Miku: “...Welcome to the SEKAI. Your feelings will give birth to this place and songs.”