Yaichi (Ryuta Sato) is a single father and he raises his elementary school aged daughter alone. One day, a foreign man named Mike (Baruto Kaito) visits him. Yaichi has an identical twin brother Ryoji, but Ryoji moved to Canada years ago. They have disconnected since that time. Mike introduces himself as the husband of Ryoji. They are a married gay couple. Yaichi is confused and doesn't know how to deal with Mike.

It is Tokyo in 1935. 10-year-old Yanagi Etsuko is a young girl who loves songs. Her father Kantaro, a struggling lyricist, still cannot forget her late mother and wastes his life away. Seeing her father like this, Etsuko begins a search for Kantaro’s second bride and the new partner who will be her mother. Her first target is her teacher Muraoka Masako whom she eggs on to land a date with her father. However, it does not go very well. The next person who catches her attention is a salesgirl Ikebe Kyoko whom she met at a department store. Etsuko is drawn to Kyoko’s simplicity and gradually begins to love her as if she were her own mother. However, at that moment, Kantaro’s elder sister Tsuruyo pursues the subject of an arranged introduction with Kusakabe Kaoru, the incredibly beautiful daughter of a bank owner who is a shareholder in her husband’s company.

In Osaka, Shiromiya will soon turn 40 years old and he is unemployed. He lives with his daughter Yoyoko who is 5-years-old. Yoyoko has a secret. One day, Shiromiya's childhood friend Machi appears in front of them. Machi is a police officer. She looks at Yoyoko with suspicion...