Sutou Aoi’s dream is to find a good partner and start a family, and at his school, there is a club to make his dream come true: the Fertility and Childbirth Club. The Fertility and Childbirth Club is a nationally recognized club activity that encourages students to become pregnant and works to help them conceive. After a selection process, Aoi was able to join the Fertility and Childbirth Club. There are two girls who want to be his partner: Tono Umi and Asagi Aika. He can choose one partner, and he must decide during the one-week trial period. The trial period is a period in which they have sex to check their physical compatibility and their feelings for each other. Umi and Aika take turns spending each day with Aoi during the trial period. Aoi begins to feel the desire to make the two happy, and they express their feelings for him. While Aoi worries about not wanting to hurt the two, the days of the trial period pass by.