The story follows , a high school teacher with a passion for traveling to remote islands. He visits the island of Ushiha, which has a unique biological history: for centuries, the women there have been able to carry a pregnancy to term in just one week. However, due to a decline in the male population's genetic quality, birth rates have plummeted. Seiichi is recruited by the island's head to serve as a primary inseminator to help revitalize the population. Key characters in the adaptation include: Seiichi Ozaki : The protagonist and traveling teacher. Konomi Tachibana : A central female lead voiced by Nohana.