Ber sure to read the manga==
available in comic book stores, on amazon.com and other places. (available in English, French, Italian and Japanese)
It's rated "16+"--but I doubt this is very strictly enforced. However, although none of the sex is explicit (uh...quite) YOU persnally might find a couple of the scenes shocking, and some of the violence really nasty--and prefer to pass on it.
Unless I mock, my heart will break--
I will burn you at the stake.