Four years into her marriage, young wife Rina Asuka desperately wishes for a child but remains unable to conceive. Her intimate life with her husband has grown stale, and everyday conversations have dwindled, widening the emotional gap between them. Deciding to pursue fertility treatment, Rina visits a clinic where she discovers her attending physician is none other than her husband's younger brother. Coincidentally, he started working at the hospital just last week and was also her classmate back at ● High School. Their relationship has been strained, and this is the first time they've seen each other since the wedding. As Rina begins opening up to him about her marital issues, she's shocked when he responds with an unexpected proposition.