Oujou Giwa no Imi wo Shire!

Synopsis

Ichimatsu Kairo's ex-girlfriend, Kusakabe Hiyori, who disappeared 7 years ago appears before him again one day. As someone who was converted into a devout follower of the Hiyori religion, he became unable to live in reality when she left. Reunited, she divulges to him her unreasonable demand, "Ichimatsu-kun, I want my childbirth recorded so give me your sperm."