経営難の夫を支えるため、美緒は小沢が営む会社の事務員となる。しかし夫の宗介は不倫に溺れ、献身的な美緒を「無能」と見下していた。絶望した美緒は、小沢から提示されていた「給料10倍の愛人秘書」の道を選び、背徳の不倫関係に溺れていく。やがて小沢は宗介の会社を買収。地位を失い土下座する夫を尻目に、美緒は小沢の愛人として、同じ職場で働く夫を見下ろす立場へと逆転する。背徳感に濡れる、復讐と再起の愛欲物語―。
To support her husband, who is struggling financially, Mio becomes an office worker at the company run by Ozawa. However, her husband, Sosuke, is engrossed in an affair and looks down on the devoted Mio as "incompetent." Desperate, Mio chooses the path offered by Ozawa: "a mistress and secretary with ten times the salary," and becomes immersed in a morally corrupt affair. Eventually, Ozawa acquires Sosuke's company. While her husband loses his position and grovels, Mio, as Ozawa's mistress, finds herself in a position of power, looking down on her husband who works in the same office. A story of revenge and redemption steeped in moral transgression.

– JavGG.net