40岁的杂志编辑咲子（苍井优 饰）原本深信自己拥有美满的婚姻，但在卷入一场事故后，她意外发现丈夫在每个月“第3个星期五”都有一段完全对不上号的神秘行踪。<br>于是，在看似美满的婚姻背后，她将面对人性中真实而扭曲的“不伦”。
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