I went into this hentai with low expectations, as I normally do with most of the hentai that I watch, but unexpectedly, Kaishun (AKA 'Sacrilege' or 'Rejuvenation') ended up being actually pretty decent hentai.
The plot follows a carnal cult that uses illicit drugs to transform men into sex-crazed monsters by selling them as health drugs through the internet as to not arouse suspicion. Police partners and lesbian lovers Atsuko and Kei are investigating a shady drug deal when they stumble upon the shocking truth.
A lot of Kaishun is actually really good. The art and animation is top notch, all of the characters are decent, both
in design and as actual characters, and the plot is actually alright for a hentai. Even the English dub is OK, if that's what you want from your hentai. But unfortunately, the whole thing ends up being a bit of a mixed bag.
As far as sex scenes go, they range from OK to pretty good. With lesbians, tentacles, and monsters (not necessarily all at once), there is some good variety here to help get your rocks off. But they're too short and too far and few between. If there is one thing you don't want lacking in a hentai, it's the amount of sex scenes.
When it comes to the plot, Kaishun has some weird choices when it comes to some scenes were edited. For example, one scene started out of nowhere, without a proper introduction as to whats going on, but then cut back to just before the stuff we just we just watch, showing what happened leading up to what we've just seen. Why not just have the scene play out normally? All this does is make the events happening, and the plot in general, more confusing.
If most of your hentai is going to be more plot than sex, then the least you could do is not make it confusing to watch. It's porn, it doesn't need some artsy fartsy editing or new and profound way of telling a story. I just want to do my business.
When it comes down to it, Kaishun is a recommendation from me. It might not exactly be a ringing endorsement, but it's a recommendation nonetheless. Not only is the sex actually good for a hentai from when it was released, but the rest of it is good enough that it makes for a neat bonus for those who are looking for some plot with their porn.