Satanofani
Girls are becoming killers. We see the protagonist, a rich high schooler, driven to display The Medusa Syndrome (blanks out and becomes a killer) when placed in a dire situation. But what is this syndrome and what will happen to this girl sent to a woman's prison with other sufferers of the syndrome? (Prepare to be frustrated, I think, by an unjust system blaming the victim.) There's some annoying, typically gratuitous ecchi content and mature content/violence/nudity. Rape trigger warning.
Tsuki no Hikari mo Todokudarou
Feeding lamb
My general advice: just don't. It's seriously gory. Not a little or medium gory. IT"S FUCKING APESHIT gory. In fact, I'd tag it torture porn. I regret my curiosity of seeing how it ended, cause I had to hold down nausea while doing so. You have been warned. (Yes, there is actual story and characterization, but geez...) If I were the type who supported censorship--I'm not--this kind of stuff would be on my list, right along with the worst or shota and lolicon.
Nina My Love