Hentai filmed on the eponymous novel from "Selen" Milky in 2006 and filmed Higuchi Yoshitaka.

The story is on behalf of the sole heir of the family of Ringo, who had become very rich after the Second World war. His name is Naoto and as the heir and only son, he must pass the sacred family rite "Himatsubushi". But for that he needs an heir, but his lover was tragically killed right after the wedding. Grandpa Naoto-kun sends him into the family of his wife Mizuko where he must choose a new passion and conceive a child. Family Mizuko much obliged to the distinguished clan Rindo and does not dare to refuse his Chapter, so Naoto have to fertilize any of the sisters during the month to become the next head...