Story wise.... Uhm....
This is pretty much hentai, except you don't see the actual penetration.
Which in a way is a good thing, because that leaves out the censorship, making the penetration bit useless either way. =P
Honestly I don't even remember why I downloaded this.
So again, back to the story. As is fitting for most hentai, there is only the slightest bit of a story that is obviously quite cliché so they can go ahead and get to the part where the sex happens.
The animation is pretty good though and soundwise... Well, it's not the worst ever.
But that's pretty much it. I'm only going to do the review on these 2 OVA's, because the other one is pretty much just part 1 and followed up by these parts 2 and 3.
And technically, if they want, they can expand to episode 4 or whatever, because there is no real end to it.
Anyway, as a proper anime it fails because of a lack of a good story, so how about as proper hentai? Nope, unless you're just as fast as them, it doesn't work as hentai either...
So which is it?
Come to think of it. It's a bit like softporn. It's legal to show on normal TV, but it just doesn't do anything. They try to put in a story, but fail and the sex scenes also fail...
The only reason for me to rate this as 'high' as I did is because at least the animation looks good.
Maybe then this is only suitable for those with an actual thing for brother/sistercon??