In a quiet Tokyo neighborhood, seven teenagers wake up to discover their bedroom mirrors are glowing. With just one touch, they are drawn away from their isolated lives into a magnificent castle featuring twisting staircases, observant portraits, and sparkling chandeliers. Within this new refuge, they encounter a series of clues pointing to a concealed room where one of them will receive a wish. However, there is a condition: if they do not exit the castle by five o'clock, they will face punishment. As time goes on, a harrowing truth comes to light: only those courageous enough to share their stories will be saved.