The special is set 3 years prior to the drama series, with the story being related to a murder case that was partly referenced in the original show. Detective Kusanagi is looking to solve a murder mystery, and he gets back in touch with his former badminton teammate, the brilliant professor Yukawa Manabu.
| Actor | Role |
|---|---|
 Masaharu FukuyamaManabu Yukawa | Manabu Yukawa |
 Masami NagasawaAkari Shionoya | Akari Shionoya |
 Kazuki KitamuraShumpei Kusanagi | Shumpei Kusanagi |
 Ikkei WatanabeHiromi Kuribayashi | Hiromi Kuribayashi |
 Miki MayaSakurako Jonouchi | Sakurako Jonouchi |
 KarinaNamie Shindo | Namie Shindo |
 Kazuma SanoShumpei Kusanagi | Shumpei Kusanagi |
 Keizo KanieYukimasa Tomonaga | Yukimasa Tomonaga |
 Ayaka KomatsuYoko Hirahara | Yoko Hirahara |
 Hiroshi ShinagawaShiro Yuge | Shiro Yuge |
 Haruma MiuraYoung Manabu Yukawa | Young Manabu Yukawa |
 Sumimaro YoshimiNot listed | Not listed |