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A thirty-year-old beautician in Kyoto was killed at home, and the scene at the crime scene was bizarre. Not long after, the Osaka Prefecture police received a letter of challenge that read, "This is a crime dedicated to Hideo Himura." On the same day, writer Arisugawa Arisu received a strange phone call at his home in Osaka. The other party said, "Someone said that you, sensei, plagiarized his work," and hurriedly invited him to meet in Tokyo. Early the next morning, after receiving an alarm from Hirano Chuo Elementary School, two patrol officers who rushed to the scene saw seventy-nine desks placed on the school playground. Looking down from a height, they saw that the desks were arranged in the shape of the number 5. ... Clinical criminologist Hideo Himura and mystery writer Arisu Arisu join forces to challenge the mystery! Peel away the cocoon and point to the real culprit!

At night, on the outskirts of Kobe City. The body of a man with his head submerged in the pond and his upper body naked. His shirt, trousers and vest were all floating on the water, while his shoes were lying next to the body. The deceased was the owner of Linden Manor, the charming and well-known psychological counselor Sakurazawa Yuichiro. Sister Asako, ex-girlfriend Nagasu Takuru, current girlfriend Moe Kitazumi, and work assistant Masato Kinugawa, these four people either hesitate to speak or make up lies when facing police inquiries... Who is the real murderer? What secrets are hidden in the depths of the olive-colored pool water? Clinical criminologist Hideo Himura and mystery writer Arisu Kawa join forces to challenge the mystery and uncover the arbitrary grudges behind the mask of "youth"!