|From what I remember, there's plenty of blood with lots of severed limbs and such (it is a seinen samurai manga after all) . You won't see any guts or anything though. Should be manageable for someone with a weak stomach for blood, gore, etc. The rest I feel need spoiler tags, so read at your own risk....
Spoiler (highlight to view)
There are several rape scenes, but actual ones and not the kind of rape that's in hentai where the person that is sexually assaulted gets turned on by it. There's also some sexual content, but it's not some random sexual encounter or fanservice -- it's all pertinent to the story. None of them are visually hardcore by any sense of the word; however, a rape scene is a rape scene, so it may be somewhat disturbing to read.
"When we remember we are all mad, the mysteries disappear and life stands explained."
- Samuel Clemens/Mark Twain