Rin makes no attempt to disguise its angle. You want violence? Fine, we can do that. You want plenty of tits to go with that? We'll make it so. Oh, and top that all off with some jaw-droppingly silly moments and you've got yourself a bloody entertaining show.
But be warned though - this series does get pretty nasty at times, so if you're squeamish then you might want to give it a miss.
Here's an extremely condensed version of the plot: over the course of several decades a pair of immortal Private Investigators fight angelic beings.
Unfortunately, the immortals (who are all women) are uncontrollably attracted to these angelic beings (who are all men); the angels, on the other hand, just want to bonk and kill the immortal women (there is ONE way to kill these otherwise immortal beings, but apart from that they're properly immortal, and can survive pretty much anything). The angels kill the "immortals" by eating them.
So, what we get are several scenes in which women are being nailed by angelic beasties, who are also busy EATING THEIR FLESH, but the women are too sexually attracted to the monsters to resist. If that isn't the most ludicrous and unintentionally hilarious plotline of the decade then I'll eat my shoes!
Actually, to be fair to the show, it does a surprisingly effective job of balancing the absurd with the sort-of-serious. The audience will actually find itself engaged, and will care about the characters and story. As I mentioned before, the plotline spans several decades so we get to see all the normal human characters grow old and die, and the world transform to the point of being unrecognisable. All of this makes for engrossing and sometimes touching stuff.
I've been careful not to give away too many details about the plot because I think that it would be best for you to watch the show and find out for yourself. Suffice it to say, what I've detailed so far should tell you whether or not this show is "for you", and what I've omitted should make for a pleasant surprise if you do give it a shot.
Oh, and you can't knock the DVD price either!
All in all, this has to be one of my favourite anime releases in recent years.