The series comes from the manga by Yoshihiro Togashi which ran from 1990 to 1994, culminating in nineteen volumes.
The Yu Yu Hakusho anime is one that continues to be quite popular and its arrival on Crunchyroll is something that definitely helps to put it in front of a lot of people that might not have seen it otherwise when it was on Funimation.
Granted with amazing new powers to be used in the cause of good versus evil, Yusuke sets out on his first assignment.