D.Gray-man Vol. 24 (manga)

Allen, now joined by two companions, is still on the run and trying to deal with his demonic alter ego, the Fourteenth. This means avoiding erstwhile allies as well as overt enemies. He also has to prevent one of his companions, fellow Exorcist Kanda, from trying to destroy the Fourteenth while keeping the Fourteenth from destroying his other companion, Johnny, whose zealous devotion to Allen is gratifying but not much help in a fight!