Seven students in Tokyo, each cut off from their loved ones and confined to their dim rooms, notice their mirrors beginning to glow. Reaching out to these reflective surfaces, they are transported to a castle inspired by the tales of Grimm, which serves as a sanctuary during school hours. Though the castle has electricity, it lacks basic necessities like food and water, and is ruled by a masked girl known as the Wolf Queen. The students learn of a key hidden within the castle walls that can grant wishes, along with clues pointing to its location. They must find this key before the school year ends and return to the real world by five PM each day, or risk losing their lives. As the deadline approaches, it becomes clear that to survive, they must share their deepest struggles. Among them is a boy haunted by his obsession with technology, another grappling with inexplicable rejection, and a girl living in fear of her abusive stepfather. Through revealing their innermost sorrows, the seven adolescents trapped in solitude and mutual misunderstanding discover freedom, resilience, and the power of their unity.