A teacher discovered two girls in the class he took over in the new school year. One was cheerful and sunny, and the other was withdrawn. Since meeting them, people around them have continued to disappear mysteriously, get injured, and even die. Finally one day, she discovered the unknown murderer and the truth behind the bizarre incident, but faced the choice of conscience and the pressure of life and death. Is it a distortion of personality or a loss of morality behind this? Is the murderer one of the two girls, someone else, or herself? Can twisted hearts and fallen angels finally be redeemed?