When a dangerous artifact is stolen by a traitor in the ranks, the exorcists travel to the location of the artifact's equally dangerous partner, which happens to be under the protection of the home temple of Rin's classmate Suguro. Tensions among the students are already high, as the others appear to have shut Rin out, but he does his best to be useful now that his secret's out and hopes they'll eventually accept him. Clan conflicts within the temple family don't help matters, nor does the fact that Suguro's extra tense due to his rocky relationship with his aging father (whom he sees as irresponsible for having given up leadership of the temple years ago).
This series has definitely improved its pacing and transitions since the first volume. It's also starting to diverge from the anime, which appears to have split off with its own ending after its schedule surpassed the available book volumes. And that's fine with me, as I'm enjoying having no preconceived notions of what's coming next.