Seven years into their marriage, a serious issue has emerged between husband and wife. Yuriko and her husband Shinsuke are struggling with infertility—the root cause being Shinsuke's low sperm count, making natural conception nearly impossible. One day, Shinsuke proposes a shocking solution: "Let's use my father's sperm for artificial insemination." Torn between surprise and confusion, Yuriko hesitates but ultimately decides to consider this unconventional path in an effort to honor her husband's wishes.