Ao no Exorcist/Blue exorcist manga: has it ended?

i really do hope that it's ongoing, and that the anime will continue too. with their epic who's the boss ladder XD it would reallly be nice to see rin and the others climb it and becoming first rate exorcists. but im not sure if its gonna be this long. there only 8 kings *spoiler* -----and one is already down but i do hope its gonna be at least 50 +.