Kekkon no katachi (2004)

The main characters, Yuri Soma (Norika Fujiwara) and Daisuke Nakahara (Shingo Katsurayama), were a couple in a de facto marriage (marriage method not registered on the family register), but one day they separated due to a water pipe leak in their apartment. However, at that time, Daisuke fell in love with Kyoko Takamizawa (Mahiru Konno) at first sight, and before long, Kyoko and Daisuke took advantage of the period of separation and an affair broke out. And Yuri is also worried about Kyoko. It is a work that incorporates elements of the "love-hate drama''.