... How did things end up this way?

Airi's words really hurted Shizuku and she ran home crying and a notification appeared on her phone seeing that the untitled sekai.. Disappeared? And there's a new untitled sekai.. She clicked on it and it was her own sekai.. "..." She clicked on it and it teleported her to the sekai and it had multiple gardens and flowers with a stage "This is..." Shizuku said before another person also teleported to this sekai.. It was Rui?