Started up last year (October 3rd I believe. Not 100% sure though) and it's grown since. It's one of those stranger series where character interaction actually works on a level other than "My (power level, chakra, chi, synch rate) is higher than yours and thus I shall own you!"
THe line between hero and villain is blurred and twistd, and the characters are almost all normal humans.
I'd run a wiki quote here that outlines the initial plot and all, but I have the odd feeling that most people have at least heard of it by now.