Four girls committed suicide one after another. It was rumoured that their deaths were caused by the “spirit of the old school building”. For most, this was just a silly rumour, but Yashiro could not just ignore it. This was because he had been troubled by a strange dream ever since the shocking incidents, which caused him to get weaker day by day due to not being able to sleep soundly. One day, he saw a black-haired girl beckoning him in the hallway, but he was pulled back by a strange girl named Velvet. She told him to be careful because he was cursed.