婚后生活并不幸福的家庭主妇笹本纱和（上户彩 饰）心中愁绪无人能知，在超市打工之际她意外结识了刚搬到她家附近的泷川利佳子（吉濑美智子 饰）以及某所中学的生物教师北野裕一郎（斋藤工 饰）。利佳子的丈夫工作体面，家境优渥，但是这个空虚的女人却沉湎不伦带来的快感。纱和起初并不认同利佳子的人生态度，可偏偏在对方的安排下和颇有好感的北野越走越近。木讷老实的北野生活中也有诸多不快，叛逆开放的学生，不将自己放在眼里的同侪以及学术上风光无限的妻子（伊藤步 饰）。他不知不觉喜欢上了单纯的纱和，两人跨越了那条禁忌之线。 另一方面，利佳子被为丈夫的杂志画插画的加藤修（北村一辉 饰）所吸引，危险的情感游戏，白日美人越陷越深……

Akira's wife walks out on him, leaving him to confide in his gangster brother-in-law. Using only a cryptic note as a clue the two brothers go on a road trip to find his wife. After a series of violent encounters with strangers, Akira meets a prostitute. The pair start a relationship. After Akira finds his wife, he questions whether he still wants to be with her.