Iroha Narimiya, a married woman facing her daughter's infertility. The young couple had hoped for children, but tests revealed the daughter was unable to conceive. Confronted with this reality, they made a difficult decision. One evening, the couple approached Iroha with quiet determination, showing her the diagnosis. Shocked by their sudden request, Iroha could not hide her surprise—but seeing her daughter's sorrow, she accepted the role she could play. Days later, on the confirmed fertile day, watched over by her daughter, Iroha began a new relationship with her son-in-law. Amid tension, his semen was deposited inside her womb. Months passed, and implantation succeeded—life was growing within her. As the pregnancy progressed, new emotions stirred inside Iroha's body, giving rise to an unexpected and intimate drama.