One day, Mio, a reporter, is shown a manuscript for a contest by Kuribayashi, the editor-in-chief. The manuscript, which she is told will likely make it to the final round, is that of Kashiwagi, who was supposed to marry Kuribayashi's daughter. Hearing the familiar name, Mio learns that Kashiwagi is now married to the daughter of a top company and holds a high position. The two are nostalgic about their reunion, but soon after, a series of murders occur. Mio investigates the case to prove Kashiwagi's innocence, even though he was suspected of murder.
Unfortunately the movie 再会・殺意の方程式 is not yet available on HBO Max.
| Writing | Tatsuhiko Kamoi | Screenplay |
| Production | Shoichi Tanabe | Producer |
| Production | Haruo Ueda | Producer |
| Production | Kai Shimada | Producer |
| Production | Shôji Masui | Associate Producer |
| Crew | Namba Sahoko | Public Relations |
| Camera | Isao Katsumura | Still Photographer |
| Directing | Masaru Konuma | Director |
| Directing | Tamio Ono | Assistant Director |
| Directing | Fumiko Imai | Script Supervisor |
| Writing | Tadaki Fukaya | Original Story |
| Production | Takashi Kosaka | Development Producer |
| Sound | Yoichi Takahashi | Music |
| Production | Katsuji Higashi | Production Manager |
| Production | Tomohiro Okada | Production Assistant |
| Production | Toshio Keo | Location Coordinator |
| Production | Tomiko Hiratsuka | Production Secretary |
| Sound | Itsumi Yamamoto | Sound Mixer |
| Sound | Chabatake Sannan | Songs |
| Sound | Kiyotaka Sugiyama | Theme Song Performance |
| Writing | Shun Taguchi | Lyricist |
| Sound | Kiyotaka Sugiyama | Music Producer |
| Sound | Tetsuji Hayashi | Music Producer |
| Camera | Junichiro Hayashi | Director of Photography |
| Lighting | Tadaaki Shimada | Lighting Director |
| Sound | Makoto Uchida | Sound |
| Editing | Nobutake Kamiya | Editor |
| Art | Hiroshi Tokuda | Art Direction |
| Art | Hirohide Shibata | Decorator |
| Costume & Make-Up | Masako Sugiura | Makeup Artist |
