If you like really nice art super powerfull Espers and an intruinging plot this is for you. Dont bother careing about that it's a so call spin off cuse I hated the original just watched a few episodes of it couldnt stand it.
You could say that this is a stand alone anime and not a spin off you do not have to watch the 55+ episodes of the original to understand this anime in fact dont just watch this instead.
This is about a world in which people with the power of ESP are seen as monsters but are still constantly beeing used by normal ppl none ESP users are known as normals. With out spoiling it for you ill say this. This is an amazingly well done anime with smart hidden meanings it makes you think a little but not to much. This is not some typicall shounen bull shit this is really an uniq anime in my appininon and deserves a sequal. Theres action in every episode and it will have you at the edge of your seat. Hope you found this helpful :).