まこは、『一回押すと十万円』が手に入る謎の『NTRボタン』を深く考えずに押してしまう。ボタンを押すたびに十万円。だが、そのたびに他人様『ま〇こ』に…。そんなうまい話があるわけがない。軽い気持ちでボタンを押してしまった代償はあまりにも大きかった。まこは必死に抵抗するがどうすることもできない。「本当に知らない人……？」気づいた時にはもう遅かった。金と引き換えに気づけば股が開いてる…不本意に始まる禁断のNTRゲーム――開幕。

Mako presses a mysterious "NTR button" that promises 100,000 yen for each press without thinking. 100,000 yen each time she presses the button. But each time, it's someone else's pussy… There's no way such a good deal exists. The price for pressing the button so casually is far too high. Mako resists desperately, but there's nothing she can do. "A real stranger…?" By the time she realizes it, it's too late. In exchange for money, she finds herself with her legs spread open… The forbidden NTR game begins against her will.