Blue Exorcist Vol. 4 — Manga Raw / Buy Official

Rin and his classmates keep building their skills as trainee exorcists. Just as they clear exams and field practice and their bonds start to take real shape, an incident that will shake True Cross Academy begins to stir. A relic tied to the "Impure King" — a demon that slaughtered over forty thousand people in the Edo era — lies sealed within the school, and sinister shadows creep toward it. The burdens carried by Suguro and the other Kyoto students rise to the surface, and the meaning of Rin's blue flames is called into question anew. Moving from training days to a full-blown war, Volume 4 opens the Kyoto Impure King arc, a major turning point for the series.