The action of this detective novella takes place in 1956. In Tokyo, a series of brutal murders, a victim of one of which was the bride of the protagonist of the novel - a detective named Tokisaka Reidzi. Six years later, history repeats itself, and Reidzi has a chance to catch the criminal this time, as his old friend from the police asks. In addition, along with the hero, you will have to investigate two more cases: the serial murder of young female students, in connection with which you will have to work undercover as a teacher of the Catholic Academy, and searching for the true "I" of one of her students who became your customer.