Yuko was asked by her husband's mistress about his cheating habit that seemed to be getting worse. Feeling flustered, she decided to give him a lecture. However, he kept making excuses leaving her at her wit's end. When he claimed he couldn't refuse because women were attracted to his big dick, she challenged him to show off his manhood right then and there. Little did she know, what awaited her was an unexpectedly huge cock that defied all imagination. Her desires ignited by its enormous size, Yuko began scheming ways to make use of this massive member.

悪化の一途を辿る旦那の浮気癖を相談された優子は、気を昂らせたまま説教へと赴く。しかし言い訳ばかりの旦那に埒が明かず堪忍袋の緒が切れてしまう。「デカチンに女性が集まってくるから断れない？それが本当なら今ここで見せてみなさい」どうせ粗チンに決まっている。見栄を張ったことを馬鹿にしてやるつもりだった優子の前に差し出されたのは想定外の巨根。想像を絶する大きさに欲求不満が刺激された優子は、なんとしてでも巨根をモノにしようと暗躍していく。