Rin: Daughters of Mnemosyne is not a show for everyone. The amount of sex and violence can lead to uncomfortable viewings (the 18+ rating is there for a reason), and the whole plot is very confusing and may take a few tries watching. Combined with the darkness of the show making it even hard to watch a times it almost got it down to a D grade. The saving grace is the two leads and the Maenos generation as they manage to get through the story, explain a number of points to keep the show being watchable, and are a combination of likeable and kickass. It's definitely a mind screw, and it's hard to watch again, but there's a decent amount of extras and characterisation which may make it at least good enough for one viewing to see if you can figure out everything.