Yukari Kawahara works at a drink manufacturer. She works hard and achieves recognition for her work. Yukari Kawahara is dating research doctor Kippei Koide. They have lived together for 5 years. One day, Kippei Koide collapses from a brain hemorrhage. Yukari Kawahara soon learns that everything she knew about her boyfriend was a lie. She hires private detective Takumi Kaibara to investigate Kippei Koide.

Sachie Kitahara is a housewife and she has devoted her life to her family. Mako Goda is a wealthy woman who runs a business. They are both diagnosed with terminal illnesses and are told they only have a short time left to live. These two women from completely different walks of life meet at the hospital. They both feel emptiness in their lives. They happen to get a 12-year-old's written bucket list. Sachie Kitahara and Mako Goda decide to carry out the girl's wish list and they begin to feel happiness entering their lives.

This will be the last. That is why I need to tell you...