Attack on Titan

Hajime Isayama's dystopian epic aired from 2013 to 2023 and became the most-discussed anime of the 2020s. Humanity lives behind massive walls to escape man-eating Titans — that's the premise, but the show evolves into a complex political thriller about war, genocide, and moral ambiguity that makes Game of Thrones look simple. The animation by WIT Studio (seasons 1-3) and MAPPA (season 4) set new standards for action sequences. Over 100 million manga copies sold. The final season sparked debates that still rage online.