A young man has an affair with an older woman. He is very jealous of her husband and decides that they should kill him. One night, after the husband had plenty of sake to drink and was in bed, they strangle him and dump his body down a well. To avert any suspicions, she pretends her husband has gone off to Tokyo to work. For three years the wife and her lover secretly see each other. Finally, suspicions become very strong and people begin to gossip. To make matters worse, her husband's ghost begins to haunt her and the law arrives to investigate her husband's disappearance.

While her son, Kichi, is away at war, a woman and her daughter-in-law survive by killing samurai who stray into their swamp, then selling whatever valuables they find. Both are devastated when they learn that Kichi has died, but his wife soon begins an affair with a neighbor who survived the war, Hachi. The mother disapproves and, when she can't steal Hachi for herself, tries to scare her daughter-in-law with a mysterious mask from a dead samurai.