The story focuses on the life of a boy, whose name is Naoto Takahashi, who is adjusting to the remarriage of his father.
Every single one of the girls is in school and adorably adorable.
The title names vary a little depending on where they were released with Sengoku Rance probably being the most popular title in the West.
Even when they do expect something horror-related, the hentai almost always turns out to be somewhat funny in the end.
There are a number of female characters, as well, but there is only one male protagonist.