The last month of pregnancy / Ringetsu the Animation

The hentai is based on the visual novel of the same name from the company "Selen" at the studio Milky in 2006, and was directed by Higuchi Yoshitaka.

The story is told from the perspective of the only heir of the Rindo family, which grew very wealthy after the end of World War II. His name is Naoto, and as the heir and only son, he must undergo the sacred rite of his family, the "Hinotsukisai". However, for this he needs an heir, but his beloved tragically died right after the wedding. Naoto-kun's grandfather sends him to the family of his wife Mizuko, where he must choose a new paramour and conceive a child. The Mizuko family is very indebted to the respected Rindo clan and does not dare refuse its head, so Naoto must impregnate any of the sisters within a month to become the next head...