The original doujin is called “高飛車な妻のトリセツ ～未開発だった妻の性感”, which seems pretty good.
Hitomi-chan who has been very popular since her school days, decided not to marry, due to her high standards. She then agrees to marry with one of her schoolmates, however, the neighbor who just moved in gets the best part of it.
Gotta be the only time in JAV history that an actress has bigger tits than the girl in the Hentai version, which are usually very exaggerated. But that’s Hitomi for you.