Fullmetal Alchemist, Vol. 15

Contains spoilers

This is where FMA stops being great and becomes all-time. The Briggs fortress isn't just a setting — it's a statement about what leadership looks like when there's no room for sentiment. Olivier Armstrong walks in and immediately becomes the most competent person in the manga. The political intrigue deepens in ways I didn't expect from a shonen. The military conspiracy, the homunculi pulling strings, the Ishvalan war's long shadow — Arakawa is juggling a dozen threads and none of them are dropping. The fight choreography in the snow is some of the best visual storytelling in the entire series. You can feel the cold.