wow. this is in the same league with the manga oddball 11.
just gotta mention the awesome cast:
sadomi the sadist, heromi the one with the chronic diseases, teromi the terrorist, jitomi the hissss, sensei poor sensei, the principal the masochist, nagomi the "green tea" class president, nidomi the oneshot character, tomomi the only normal girl who's so apathetic with all the abnormalities around her (my favorite)