Masahiro Sato

身分は曖昧。昇進も関係なし。培った刑事の勘と人脈を武器に再雇用警察官・安治川が難事件に挑む！ 定年退職した安治川信繁（高橋英樹）は、再雇用警察官として、行方不明者が自発的か否か選別する、神奈川県警生活安全部・消息対応室にいる。そこは県警から左遷された室長・芝隆之（石黒賢）、新月良美（本仮屋ユイカ）が在籍。主な仕事は行方不明者リストのデータ化、部屋は元倉庫という地味な部署だ。 新たに行方不明者届が提出されたのは、川崎市内に店を構えるイタリアンシェフ池ノ上祥一（金山一彦）。だが“一般行方不明者”かに思えた祥一の失踪は、やがて思わぬ方向へと発展。なんと店近くで発見された撲殺体の手に、祥一の店の名刺が…。安治川は早速聞き込みに回るが、畑靖史（佐戸井けん太）、八木紀佐子（床嶋佳子）ら店を解雇された元従業員が口にしたのは、祥一ではなく妻・美世（遊井亮子）への不満ばかりで――。

2年前、ホテル「プラトン東京」から、ここ「プラトン ロイヤルホテル八ヶ岳」に総支配人として着任した東堂克生（内藤剛志）。お客様に最高の時間と空間を提供するため、スタッフとともに日々奮闘している。コンシェルジュの北山修二（東根作寿英）は、宿泊客パスカル・アンリ（Frederick Benoliel）と静子（いしのようこ）夫妻の恩人探しに奮闘。若手パティシェ・須藤義之（田中俊介）の作るスウィーツは宿泊客に好評で、人気作家・中上冬樹（デビット伊東）はそれを目当てに滞在するほどだ。須藤は、松岡みのり（山下リオ）との結婚も決まっており、ブライダル担当の山下みなみ（あめくみちこ）は、同僚の結婚式の準備に張り切っている。

Inspector Totsugawa of the First Investigation Division goes to Tsuruoka in Yamagata to attend the wedding of the son of Inspector Mukai, his former colleague who now works for the Yamagata Prefectural Police. While sightseeing at Mt. Haguro after the ceremony, he notices a young woman drawing him in her sketchbook. She introduces herself as Yuka Shiraishi and says she came to draw the Dewa Sanzan. Signing the drawing of Totsugawa next to the five-story pagoda with her initial, a 'Y' in the corner, she gives it to him as a present. The next morning, the corpse of a young woman who has been stabbed is discovered in a forest in Tsuruoka. When Totsugawa, on his way back, hears that a sketchbook signed with a 'Y' was found at the scene, he follows Mukai there. However, the body is not Yuka, the woman Totsugawa had met, and while no items pointing to her identity are found, the sketchbook is the same one Yuka had the day before.

Detective Kamei of the First Investigation Division receives a request from lawyer Shinichi Nakamura, the son of his deceased close friend, to re-investigate a car accident. Akiko, the wife of Yasuo Furuki, a painter from Hakone, died in the accident 5 months earlier by crashing into a guardrail. Nakamura's client, Akiko's younger sister Yuki Izeki, suspects that she was actually murdered by Furuki for insurance money. Overwhelmed by these thoughts, Yuki had sent an email reading "I'll never forgive that man. I'm going to kill him and avenge my big sister," announcing a murder to Nakamura. In the middle of their conversation, Nakamura receives a call from Hakone PD confirming that Yuki had turned herself in that morning...

The strangled dead body of Hiroshi Hatano, accounting section chief at the longstanding apparel company Edaka International, is discovered in his apartment in Tokyo. At the scene, Inspector Totsugawa and Detective Kamei find out that a mysterious email stating "I'll be riding the Super Ozora 5 tomorrow" was sent to the victim's cell phone the night before. The sender, Manami Furuya, an employee of Edaka International's Planning Section, has strangely terminated her cell phone service and hasn't shown up to work that very morning. Immediately afterwards, Totsugawa is astonished to receive a report from the Hokkaido police stating that the body of a man, stabbed to death, has been found on the Super Ozora 5 limited express. The man is Yuuki Nakamura, a bar employee from Tokyo, who seems to have flown from Haneda Airport to Sapporo and then boarded the Super Ozora 5, which connects Sapporo and Kushiro. Totsugawa has the feeling that this can't be a coincidence...