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"...
Unfortunately the movie Detective Kyosuke Kozu's Murder Reasoning 6 is not yet available on HBO Max.
| Directing | Yukio Noda | Director |
| Writing | Kikuma Shimoiizaka | Screenplay |
| Writing | Akimitsu Takagi | Original Story |
