Sakuya Shirase then wake up from her sleeps andfinds herself in some rooms, who is not her room, due to the room who is too fancy and luxury for girl like her. She then closed her eyes and pinchs herself to make sure this is not dream.

after then she is notices the outsides of window, who is somehows like is an endless void, where in every direction, there is a mix of iridescent colors, who somehow very similliars to Kaleidoscope

This make Sakuya confused and panic, what is going on?!