Kanji Takizawa worked diligently at a bank, successfully reaching the position of branch manager. Despite the fact that his conversation with his wife Mariko was dwindling and there was a growing distance between him and his young, unmarried daughter, Misaki, he had come to accept his peaceful life. One day, Kanji gets loaned out to a client company for an unjustifiable reason. Shocked, Kanji lies to his family that he was going on a business trip to Switzerland, where he meets and finds a kindred spirit in Shiori Meguro. Meanwhile, Mariko suspects that her husband may be having an affair, and finds herself falling in forbidden love with her daughter’s fiancé, Haruki Hino.

“无法抗争的命运的恋爱…三人编织出立于人生歧路的男女间令人感伤的爱情故事——”

　　主人公瀧沢完治在银行工作，工作认真努力。和妻子瀧沢真璃子最近对话变少，和女儿也有所疏远，但他也接受了如此平稳的家庭生活。但某日被毫无道理地降职左迁，使他对自己的工作产生了极大的困惑。出现在他面前的是一张雪山的海报。他以出差为名，一个人去了瑞士。在瑞士的风雪中，他看到了一位日本女性——目黒栞，知性、有品位的她也是一人前来旅行。大雪裹山，月照山头的夜晚，两人是旁人未曾想的投机…

　　另一方面，真璃子怀疑丈夫出轨却又未问出口，这样的她，竟对女儿的未婚夫陷入了恋爱…

該劇改編自弘兼憲史所作同名漫畫的第一集《不惑之星》，講述陷入事業低谷的瀧澤完治在與妻子真璃子感情殆盡後，與另一位女性目黑栞陷入成人愛情的故事。