The Solitary Castle in the Mirror

The Solitary Castle in the Mirror follows seven students in Tokyo who use a magical portal in their mirrors to escape to a mystical castle during school hours. The castle, lacking basic necessities but filled with clues, is home to the enigmatic Wolf Queen and becomes a refuge for the students. Their ultimate goal is to find a hidden key that will grant one wish, but they must do so by the end of the school year and leave the castle each day by 5 o'clock to avoid a fatal consequence.