The school is divided into a variety of classes and so on. There, too, each year or semester determines the strength of the students and their "Level". Karma is the strongest, while Mason, his former close friend, and now rival and enemy, comes right after him. Basically, the most popular ghosts at school are Karma, Mason, Malvina, Olivia, Asher, and two twins - E and Ai.  The twins are just kids, Karma basically intimidates everyone and he's a loner, and the rest of them bunch up in a "gang".