Yotsuya Kaidan : Act 1

Tamiya Iemon, a rōnin, is having a heated exchange with his father-in-law, Yotsuya Samon, concerning Samon's daughter Oiwa. After it is suggested by Samon that Iemon and his daughter should separate, the ronin becomes enraged and murders Samon. The next scene focuses on the character Naosuke who is sexually obsessed with Oiwa's sister, the prostitute Osode, despite her being already married to another man, Satô Yomoshichi. As this scene begins, Naosuke is at the local brothel making romantic advances toward Osode when Yomoshichi and the brothel's owner, Takuetsu, enter. Unable to pay a fee demanded by Takuetsu, he is mocked by both Yomoshichi and Osode and forcibly removed. Shortly thereafter an intoxicated Naosuke murders Okuda Shôzaburô, his former master, whom he mistakes for Yomoshichi. This is implied to occur at the precise time of the slaying of Samon. It is at this point that Iemon and Naosuke unite and conspire to mislead Oiwa and Osode into believing that they will exact revenge on the persons responsible for their father's death. In return Osode agrees to marry Naosuke.