Mathematicians Susumu Nihonmatsu (Takanori Jinnai) and Shigeo Noda (Hiromasa Taguchi) win a prestigious award, but in reality, most of the work was done by Noda alone. At the hotel in Australia where the award ceremony is held, Nihonmatsu is called by Noda's wife, Hikaru (Maki Mizuno), with whom he is secretly in love. Shigeo is lying on the floor motionless after being pushed by Hikaru. After disguising it as an accident, Nihonmatsu creates an alibi involving Furuhata and Imaizumi, who are also on a vacation at the same hotel. Upon returning to his hotel room, Noda is seen by Nihonmatsu alive. After a brief argument regarding a mathematical theorem, Nihonmatsu kills Shigeo and stages a second accident scene involving Noda.

Avant-garde flower arranger Futaba Fusui (Yamaguchi Tomoko) breaks away from her master Futaba Hosui's (Osanai Minako) style and establishes a school mixing dance and flower arranging. However, due to the harassment the school's survival is in jeopardy. During the school's recital, Fusui poisons the invited Hosui. As Furuhata was in attendance, he can't quite figure out how the killer found her victim in the dark auditorium.

Popular idol group SMAP member Tsuyoshi Kusanagi's (Tsuyoshi Kusanagi) uncle and father figure to the other members, is driven to suicide via blackmail by Akio Togashi (Toshi Ukaji). Togashi uses this as leverage to extort Kusanagi, which angers the other members. During the night of their concert, Togashi is strangled to death and made to look like suicide. Thinking it was a perfect crime, Furuhata notices the strange acts among the members of SMAP during the performance, the receipt for the rope in Togashi's pockets, and the unusual alibis. Can the detective find conclusive evidence linking them to the death of their blackmailer?

Strange murders occur in which fortunes are stuffed into corpses. Furuhata, who had been transferred to the police dog training center, is summoned to take on the investigation. Furuhata turns his attention towards Kuriowa (Ken Ogata), the medical examiner in charge of the victim's autopsies.

Ambassador extraordinaire and plenipotentiary to a Latin American country Takechiyo Mayuzumi (Koshiro Matsumoto), kills counselor Ken Kawakita (Mitsuhiro Oikawa) after discovering his collusion with a local company. Mayuzumi makes the death look like a kidnapping by an anti-Japanese group, with the ransom note concerning Furuhata, who is staying at the embassy due to passport issues.

When the president of Horibe Bread Co., is killed by a bear, his nephew Daikichi (Tetsuya Chiba) is promoted to president along with Daikichi's younger brother Otoya (Tatsuya Fujiwara) as vice president. The brothers are at odds about developing the land behind the factory, Daikichi wanting to turn it into a resort and Otoya against it outright. Otoya discovers a notebook with notes on "how to kill someone" when helping his friend Kyosuke Tenma (Koji Ishizaka). Daikichi is soon killed with Furuhata quickly figuring out the culprit, only the person responsible may be dead themselves already.

Furuhata's longtime friend Mukaijima retires from the police force and now works as a security guard at Baritone Hotel. While there, they meet MLB player Ichiro (Suzuki Ichiro), half-brother to Mukojima, who has returned to Japan. That night, Shigeru Koriyama (Tomohiko Imai), a freelance writer who had been threatening Mukaijima for a while visits the hotel. Ichiro, obsessed with fair play, takes measures into his own hands and poisons Koriyama. Furuhata investigates and notices some damp matches; suspecting the baseball player isn't playing by the same rules anymore.

Momiji and Kaede Ohno (Nanako Matsushima) are identical twin screenwriters under the pen name "Kyoko Kagami." Furuhata has been the advisor for the drama series "Bulgari Sanshiro" which has concluded its final episode to great success. However, the sisters have been feuding, culminating with Kaede shooting Momiji, who wanted to split due to creative differences. Furuhata is in charge of investigating the death, only his unexpected feelings to the surviving sister are complicating his duty as a detective.