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刚入社会，就职于商社的新人成田美纱绪（见上爱饰）十分讨厌在同一个部门工作、业绩突出却说话不过脑的市川一哉（佐藤大树饰）。然而，她却在一些机缘巧合之下，对市川产生了好感。而市川也被工作利索、敢于直面爱情的美纱绪吸引。最终两人发展成了肉体关系。但是，市川却有着一位以结婚为前提正在交往的女友。“他到底是打着什么算盘跟我做的？”美纱绪的脑中充满了混乱，明知自己是第三者，却依旧和市川保持着“地下关系”。渐渐地，美纱绪和市川产生了分歧。肉体相交，心却无法交合的二人将会走向怎样的结局呢？
Misao despises Kazuya but falls for him. She learns he's with Yuko but can't let go of her love. Can she claim love?
Ichikawa warms to Misao's talents and honesty. He offers to date Tadokoro while feelings for Misao deepen.
Misao desires Ichikawa despite his engagement to Tadokoro. Affairs unfold, leading to a critical call for Ichikawa.
Misao can't forget Ichikawa, their passion unspoken. A twist awaits as a new job offer beckons.
Passion reignites as Misao reunites with Ichikawa on a business trip. Will their intense affair lead to lasting love?
Love blooms, but secrets unravel. Misao's world shatters when a call reveals Ichikawa's affair.
As Misao's love life spirals, secrets emerge. Will she find happiness?
A web of secrets and unexpected turns as Ichikawa discovers a life-changing truth about Misao's pregnancy.
