风起云涌的20世纪70年代，英语系学生矢野布美子（石原里美 饰）受聘于大学副教授片濑信太郎（井浦新 饰），担当起英语文学翻译的助手。片濑的妻子雛子（田中丽奈 饰）仪态端庄，千娇百媚，曾是出身某个子爵家庭的大小姐。小布受到片濑夫妇的喜爱，但是这对夫妇颇显怪异的相处方式也让她倍为不安。雛子同时与片濑的学生以及少女时代的故交交往，而片濑对此丝毫没有妒意，反而泰然处之。在轻井泽的别墅里，小布俨然成为片濑夫妇最重要的存在。可是恣意疯长的爱恋突然失控，雛子喜欢上了当地的青年电工（斋藤工 饰），片濑觉察到这个变化，心中的猛兽出笼，也由此酿成了无法挽回的悲剧……

The story is set in the 70s where Ishihara plays Fumiko, an university student, who gets involved romantically with her assistant professor Katase Shintaro (Iura Arata) and his wife Hinako (Tanaka Rena). However, on 28 February 1972, the police finds Shintaro seriously injured and a young man working in a electronics store (Saito Takumi) dead in a bungalow at Karuizawawhile Fumiko and Hinako are also present at the scene. The truth behind the case is not known and the case is quickly classified as a crime of passion which leads to Fumiko being sent to prison. 40 years later, a report writer Torigai Mitsuhiko (Watabe Atsuro) comes to know about this case and goes to interview the elderly Fumiko (Harada Mieko) in prison which leads him to find out what really happened at the bungalow.