Stone-faced commuters are oblivious to the fact that their daily train ride has become a hunting ground for the alluring beauty, Reika. As her body responds to the unseen touch of a man's fingers, she can't help but crave more... even though her mind tells her it should be wrong. Her voice silenced by shame, she watches in disbelief as her own arousal causes an outpouring of sweet nectar. It seems fate had nothing to do with their union; rather, it was the filthy bond created by their shared lust. Submissively, Reika continues to indulge in their illicit affair, eagerly awaiting another chance encounter on today's commute.

通学で毎日のように利用する電車でチカンの標的になってしまった澪。音もなく忍び寄る漢の指がまさかこんなに気持ちいいなんて…。控え目に言ってドストライク！頭では嫌なはずなのにカラダは求めてしまう…。声を出せない中、自分でも信じられないほど愛液が溢れて糸を引いていた！結ばれてしまったのは運命の赤い糸ではなくふしだらな愛液の糸。従順になった澪は不純な関係に身を堕とし、今日も漢の待つ電車に乗車する。