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On the last day before summer vacation, Mr. S did not come to school and hanged himself at home. I clearly saw his body, but the body disappeared and no one believed what I said. Seven days later, Mr. S actually turned into a spider and appeared in front of me, claiming that he had been killed. What I could do for him was to find his missing body... During those days, the cats and dogs disappeared; that summer vacation, my partner left; that summer, the most beautiful sunflowers did not bloom...

"I know your secret." In order to protect his daughter, Fujiwara concealed the truth about his wife's death 15 years ago. Now, a blackmail call will completely destroy the peaceful life of the father and daughter. In order to avoid blackmail, he took his daughter and fled to his long-lost hometown. Fujiwara did not expect that what awaited him there would be the many mysteries surrounding his mother's murder 30 years ago: strange sacrificial customs, the mother who died mysteriously, villagers who were poisoned one after another, the shrine manager who committed suicide by hanging from a beam... The intertwined memories of three generations gradually revealed the dusty truth behind the murderous intention! Fujiwara was surprised to find that the murderous intention that surged 30 years ago has not dissipated yet...

Won the 144th Naoki Award, a must-read for reasoning enthusiasts. Every detail is a foreshadowing of the ending, taking you to the top of psychological suspense.