Kuroi Gashu: Shogen

Teiichiro married his wife, Sachiko, and succeeded his wife's parents' company, Ishino Clinic, in Kanazawa. Although the doctor is reputed for his straightforward work, he has been hiding a secret from his wife for three years. He has been having an affair with a college student, Umezawa Tomohisa. One day, a detective investigating a murder case comes to Teiichiro. A man named Sugiyama, arrested for alleged murder, claims his alibi is that he had met with Teiichiro at the time of the incident.
(Source: MDL)
~~ Adapted from the short story "Shogen" (証言) by Matsumoto Seicho (松本清張).