Blue exorcist, vol. 9 (Viz Media)

All of Rin's friends have done their best to hold off the deadly Impure King so Rin can confront it. Now it's entirely up to Rin finish off the gigantic demon. Although Rin has finally drawn the Koma sword and found his confidence, that alone may not be enough to defeat the Impure King! And Yukio's battle with the possessed Saburota Todo may have awakened something dark deep within him.