An actor named Kosuke plays the role of Iemon in a stage version of Yotsuya Kaiden and his new lover Miyuki plays Oiwa. However, as they delve deeper into their respective performances, the line between fantasy and reality becomes obscured until the murderous, vengeful themes of the play bleed into their own relationship.

Yasutake Shingo is a newspaper reporter whose only redeeming feature is his earnestness. He meets Matsunaga Chie, who attends a music college, and they start dating. Each day becomes all the more bright and enjoyable for Shingo because of the lively Chie. She loves to laugh, sing and eat. After one and a half years, Chie is employed as a music teacher. One day, Shingo is informed that Chie has breast cancer. After thinking about it, he decides to share a lifetime with her and proposes. His proposal gives her the courage to undergo surgery which she had been mulling over. One day, Chie starts to teach 5-year-old Hana the “important things in life” such as laundry, cleaning and cooking. She thinks that even if she is no longer around, her daughter and husband will be able to live.