Three couples stay at a lakeside cottage with their children. They want them to prepare intensely for a prestigious high school entrance exam with the help of a private tutor. One night, one of the wives confesses to her husband that she has killed his mistress.
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Character: Shunsuke Namiki
Character: Minako Namiki
Character: Tomoharu Fujima
Character: Masaru Tsukumi
Character: Takashi Sekiya
Character: Yasuko Sekiya
Character: Kazue Fujima
Character: Eriko Takashina
Character: Maika Namiki
Character: Naoto Fujima