Ayanagi Academy is transformed by the onset of Halloween, with vibrant pumpkins, captivating decor, and delicious autumn treats. Yuuta Hoshitani and his friends are excited for the upcoming festivities, but their joy is cut short when Kouki Nanjou shares a chilling ghost story that fills them with anxiety. As night falls, ghostly figures materialize and the lights in their dormitory flicker, prompting everyone to question the validity of Nanjou's tale. While some cower in fear, others bravely venture out to unravel the mystery behind the phantom events.