Night Drum

 is a 1958 Japanese historical drama film directed by Tadashi Imai. It was written by Kaneto Shindo and Shinobu Hashimoto, based on the 1706 play "Horikawa nami no tsuzumi" by Monzaemon Chikamatsu. Film historians regard "Night Drum" as one of director Imai's major works.
Plot.
Samurai Hikokuro returns home to his wife Tane after a full year at his shogun's residence in Edo. Rumours have it that Tane committed adultery with a musician in his absence, so the family clan summons for an interrogation. In a series of flashbacks, Tane is first cleared from the charges pressed against her, but after Hikokuro's sister renews the accusations, she finally admits her guilt. In her confession, she recounts how she had first escaped a rape attempt by the very samurai responsible for the rumours about her and, being drunk and in fear, had later spent the night with the musician. In compliance with the samurai honour, Tane is required to commit suicide, and her lover declared fair game. Although Hikokuro has forgiven his wife whom he still loves, he first kills her as she is unable to do so herself, and then the adulterer.