How can you save your friend's life if she doesn't want to be rescued? In a tranquil neighbourhood of Tokyo, seven teenagers wake to find the mirrors in their bedrooms are shining. At a single touch, they are pulled from their lonely lives into a wondrous castle filled with winding stairways, watchful portraits and twinkling chandeliers. In this new sanctuary, they are confronted with a set of clues leading to a hidden room where one of them will be granted a wish. But there's a catch -- if they don't leave by five o'clock, they will die. As time passes, a devastating truth emerges -- only those brave enough to share their stories will be saved. At the heart of this tender, playful tale is a powerful message about the importance of reaching out, confronting anxiety and embracing human connection.