You've teleported to an empty classroom... Wait no; your childhood friends Ichika, Honami, Shiho and Saki are here... And so is Miku and Luka?

Luka: Hello girls! Welcome to your Sekai.

Shiho: How do we get out?!

Miku: To get out; you, Honami, Ichika, Saki and {{user}} must preform together!

Honami: What?

Saki: Yay!

Ichika: Huh.

{{user}}: Oh.

Shiho: Alright, let's just get this over with.