Kenji Matsushita is a reportage writer. While he was interviewing the tattoo contest, he met a woman with a tattoo of a large snake, Kinue. Kineda is the mama of the bar and the wife of the president of the earth-moving company, Mogami. She was a sympathetic woman, and Kenji was drawn to her body and spent the night together. The silk branch was found in a dismembered corpse in the bathroom of her apartment, and the carved torso of the snake disappeared. Since the bathroom was completely closed, the investigation was stopped. So Kenji consults with his lover, Nobuko's older brother, Kyosuke. Kyosuke is a genius, and he solved the mystery of the closed room without difficulty. However, the criminal cannot be identified yet.

The third work of the popular series depicting the famous detective Kyosuke Kozu. Blind musician Ryoichi Kashiwagi died of a heart attack. His father, Shigeyuki , is already bedridden and has billions of Japanese yen in assets. Ryoichi's wife Yukiyo and Ryoichi's younger sister Tsuruko have a dispute over these assets. Newspaper reporter Matsushita, who met Ryoichi just before his death, was interviewed, and was told that there was something unnatural about Ryoichi's cause of death. Soon, Tsuruko died mysteriously. Matsushita decides to have Kyosuke Kozu, a university professor and a famous detective, solve the case.

Kenji, a disciple of the famous detective Kyosuke Kozu, had a strange experience in the world. He was asked by a woman named Shoko Ima to find the corpse in the soil. Shoko is a famous dancer in the modern ballet world, and she just married doctor Fujimoto 10 days ago. However, on that day, Shoko had disappeared. Her corpse seems to be at the base of the ginkgo tree in the house of the sculptor Kagawa, who was rumored to have a romantic relationship. Police arrested Konosuke. However, Kagawa was also suspicious.

The third work of the popular series depicting the famous detective Kyosuke Kozu. Blind musician Ryoichi Kashiwagi died of a heart attack. His father, Shigeyuki , is already bedridden and has billions of Japanese yen in assets. Ryoichi's wife Yukiyo and Ryoichi's younger sister Tsuruko have a dispute over these assets. Newspaper reporter Matsushita, who met Ryoichi just before his death, was interviewed, and was told that there was something unnatural about Ryoichi's cause of death. Soon, Tsuruko died mysteriously. Matsushita decides to have Kyosuke Kozu, a university professor and a famous detective, solve the case.

The sixth popular suspense series based on the original work by Akimitsu Takagi. Kyosuke Kozu was invited by former actress Shinobu Yuki, who had previously appeared on a magazine, to announce the production of the drama. The producer is Kako's husband, Fujita. When the press conference was about to end, the leading actress Hitomi was shot dead. She is suspected of being abandoned by Hitomi, her nephew Mizukami, but there is no evidence. Subsequent investigation reveals that Hitomi has been dating Urushida for three months. A few days later, Kako showed Kyosuke three threatening letters stating "Your life will be end in 10 days"...

Newspaper reporter Kenzo let a strange woman Emi took taxi while on the way home from a business trip. Later, when he stopped by his girlfriend Nobuko's house to give her souvenir, he noticed that the suitcase had been replaced by Emi's. A knife with blood wiped out came out of Emi's trunk. Nobuko's older brother Kyosuke is a university professor, but he is also a famous detective. The next day, Kyosuke made Kenzo follow Emi's elder sister, Yuri, who came to exchange the trunk. Emi and Yuri are daughters of the landowner Kayama family, but they were both children of their ex-wife. His second wife, Shizue, has Miyako, another kid. Emi had a bad time with Shizue and left home, and she had just returned for the first time in three years...

Newspaper reporter Kenzo let a strange woman Emi took taxi while on the way home from a business trip. Later, when he stopped by his girlfriend Nobuko's house to give her souvenir, he noticed that the suitcase had been replaced by Emi's. A knife with blood wiped out came out of Emi's trunk. Nobuko's older brother Kyosuke is a university professor, but he is also a famous detective. The next day, Kyosuke made Kenzo follow Emi's elder sister, Yuri, who came to exchange the trunk. Emi and Yuri are daughters of the landowner Kayama family, but they were both children of their ex-wife. His second wife, Shizue, has Miyako, another kid. Emi had a bad time with Shizue and left home, and she had just returned for the first time in three years...

President Ito, a major apparel maker, was poisoned in the president's office. Kenzo (Baku Ohwada), who happened to be interviewing nearby, rushes to the site. According to his secretary Masae, Ito's ex-wife's younger brother Yoshimoto visited and he started arguing with Ito, but he suddenly escaped. Kenzo asks Kyosuke Kozu (Masaomi Kondo) to investigate. It turns out that Ito's son Takashi, who was killed, is enrolled in Kyosuke Kamizu's university. When Kyosuke Kamizu met at the university, his mother-in-law, Yoko, aimed at his father's fortune and said, "I think he teamed up with designer Kawahara ." Yoko has a relationship with Kawahara, and Ito, who died, was confused because she had an affair with her secretary, Masae. Takashi is said to have already left home and is living on his own.

The 7th popular suspense series based on the original work by Akimitsu Takagi. Along with Kogoro Akechi of Ranpo Edogawa and Kosuke Kindaichi of Seishi Yokomizo, Masaomi Kondo will play Kyosuke Kamizu, one of "Japan's Three Greatest Detectives", and will solve numerous challenges! A threatening letter foretelling the murder of the entire family came to the house of Tobe, who presides over the infamous investment group. Kumiko Toki, the third daughter of the family, consulted with the police, but she simply thought it is done by someone who recently lost investments. Kenzo, a reportage writer who was listening, became interested and brought the threatening letter to Kozu, asking him to investigate...