Yu Yu Hakusho is a manga created by Yoshihiro Togashi that ran in Shonen Jump from December 3, 1990 to July 25, 1994 with a total of 19 volumes and had a total of 175 chapters. The series is a battle shonen and a very influential one at that. If Dragon Ball set up the basic format for these types of stories, then Yu Yu Hakusho helped codify a lot of the more specific ideas and situations that tend to pop up in the genre.
What is Yu Yu Hakusho about?
The series follows Yusuke Urameshi, a delinquent junior high school student who is good at street fighting and not much else. Yusuke is a punk through and through, which is why everyone was so surprised when he sacrificed his life to save a child from a speeding car. Even the afterlife was unprepared, so they hadn't been able to arrange a place for him yet. Instead, Koenma, second-in-command of the Spirit World, gives Yusuke a trial to gain his life back. After successfully returning to life with the help of the strangely chipper grim reaper Botan, his rival Kuwabara, his best friend and definitely not girlfriend Keiko, Yusuke is told that he is now required to become the Spirit Detective and track down and defeat the demons that are threatening the living world. Yusuke, along with his friends, two reformed (to varying degrees) demons named Kurama and Hiei, and the world's greatest psychic Genkai, must protect the world from all sorts of dangerous foes.
The Anime
Like a lot of popular manga, Yu Yu Hakusho got an anime adaptation. Unlike most other adaptations, Yu Yu Hakusho's anime does not suffer from filler or padding in the slightest. You won't need any filler guide here. You can just watch the whole series from start to finish without issue. It's a really great adaptation all around, and it nails every key point of the series. It does switch things up a bit compared to the manga, but that's actually a good thing. The anime manages to improve on points where the manga had problems, particularly the ending, which had to be rushed in the manga due to executives trying to mess with the series. On top of all that, the anime also has a fantastic dub which still holds up despite its age. The anime is probably the version of Yu Yu Hakusho that most people would recommend.
Where to Read and Watch
The manga is licensed by Viz Media and can be bought on their site, though the first 3 chapters are free.
https://www.viz.com/yuyu-hakusho
The anime is currently available on FunimationNow, Crunchyroll, and Hulu.
https://www.funimation.com/shows/yu-yu-hakusho/
http://www.crunchyroll.com/yu-yu-hakusho
https://www.hulu.com/yu-yu-hakusho