This was a pretty good hentai(judging hentai differently from normal anime for obvious reasons), just lots of sex without a forced story shoved in, because lets admit it, we dont(atleast the majority of people) watch hentai for the story.
If you dont like incest, 4somes and lolicon hentai, then stay away from this.
A good thing, relatively speaking, is that it does not have NTR or rape, which are quite prevalent in hentai.
A plain summary of this anime is this:3 idols, who are also sisters, fuck their big brother, who is also their manager.There is only 1 episode, which is of the standard length, i.e, ~20 minutes.