This series follows Guts; a mercenary who wields a huge sword. Normally he doesn't work with others but after meeting the enigmatic Griffith he joins his mercenary group; the Band of the Hawk. They fight alongside each other and the Hawks have more and more success in battle. This makes Griffith one of the king's favourites which upsets the aristocracy who believe he is getting above himself. Over the course of the series the group fight numerous battles and much blood is spilt. We also learn more about Guts and Griffith's pasts. Obviously it isn't all fighting; there is an element of romance involving Casca; the second in command of the Hawks.
This series is a remastered version of the three films released 2012/13, which were in turn based on the same material as the 1997 anime series. One might think that this makes the series superfluous; perhaps it is but it is still a great series. For those who have never seen any Berserk this series is a good introduction. The characters are great, especially Guts, Casca and Griffith. The amination is really good; certainly much better than that used in the 2016 series, which details events after this series. There is plenty of violent action, as well as some sex and nudity which means this won't be suitable for younger or more sensitive viewers. Overall I'd certainly recommend this to fans of Berserk in particular and fans of action anime in general.
These comments are based on watching the series in Japanese with English subtitles.