
A pale-looking man, Kazuhiko, is being questioned by the police following the extremely bloody murder of a young woman. He begins his story with the day that two sisters, Tsukiko and Mayuko, moved into the house across from his. After helping the pair move in, he starts talking with the younger sister, and soon they become intimate. The relationship continues for a while, but one day the sisters suddenly pack up and disappear, but not before sharing their secret with Kazuhiko. What kind of secret could have caused him to commit such a murder? Or did he?
Cheating Notes

Two sisters, Tsukiko and Mayuko, moved into the house across from Kazuhiko. Eventually, Mayuko becomes Kazuhiko's girlfriend and they have sex (10:20).
Tsukiko visits Kazuhiko in his house and seduces him. He gives in and they have sex (22:18).
Apparently, Tsukiko and Mayuko are not really sisters—their relationship is something else entirely. They get into an argument when Mayuko discovers that Tsukiko seduced Kazuhiko, accusing her of always stealing her boyfriends. Tsukiko initiates kissing with Mayuko. Though hesitant at first, Mayuko eventually gives in, and the two engage in lesbian sex with the aid of a dildo (30:47).
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