Its old school, and the manga is just out of this world. Real dark, demons, blood, sex, huge epic medievil battles, Hell, hallucinations, **** off big as sword, Beasts, Gore, brutal. The manga spans over most of the main characters life, and is ongoing (since 1989 For ****s sakes!) the author has been releasing like one giant graphic novel every six months for the last 20 years pretty much. Next one is out in september. Pure EPIC (refering to the manga)
The anime is still really good if you have a liking for old school anime, or if you arent too fussed with the quality compared to todays anime. Still though, this is one to watch and Ill preach and preach !~
EDIT: also what I really like about Guts (the main character) is that hes constantly plagued by death and suffering, and the more pain he recieves the stronger he becomes.. kinda like his soul feeds of the torture and brutal battlefields which feeds his emense bloodrage, but hes still strongly moralistic and completely merciless, MERCILESS!!