 If you liked
Koroshiya 1
|
 ...then you might like
Satanophany
|
MC strays from the normal path, becoming murderers, somehow with another personality. The authors visually don't shun sexually explicit scenes of rape and the likes.
*As you could expect, these are both Seinen.
(*As for Koroshiya 1: read the prequel as well, then the picture becomes one)