Sorry about the lack of formatting, it was 4am and I just wanted to get it out before I went back to sleep. In fact, the switching of scenes to the bad guys was after I went back to sleep, and continued the dream. Also, yeah, this is from ages ago.
A few students have acquired the ability to generate a toxic black sludge that can become and consume anything. A group of boys who use this power use it to bully others, making them disappear or turn into beings who can't survive in sunlight. Maze in student council area and second group made up of a girl who was turned into shadow, a man who is immune, and a man who can manipulate it is formed. Earlier, the immune one and the girl formed a friendship after encountering the leader, who the girl has a grudge against because he killed all her friends and made her so she can't live in the sun. Actually, the one who can't live in the sun is male, the girl is someone who also acquired the ability of sludge with the first group but who the first group hates because she won't join them. Anyway, those first three originally try to escape both the man who manipulates sludge (friendly) and the maze, without help so that they can pursue the leader. So that they don't get lost, they mark the walls with the black sludge on the left. The man who was a part of the first group who is pursuing the leader for his own reasons initially runs against them and throws up walls and throws sludge bombs that eat people at them, but after getting lost, decides to join them, and conjures food as a peace offering. Meanwhile, the first group has taken an elementary school hostage. The teacher having already been turned into black dust, They decide to pull up a mentally retarded child and declare that they will teach her why her life is really not worth as much as the others. They pull her from her wheelchair and lay her on a stretcher, and they tell her that they plan to kill her. With a smile on her face, she asks clearly, "please, don't". Then, the boss offers her candy. The candy, made from the sludge and laced with poison, slowly kills the girl, and her classmates watch her die.