Attack on Titan

The Attack on Titan watch order spans every season from episode 1 through the Final Season, plus five OVAs including No Regrets and Lost Girls. Start with the 25 episodes of season one, then watch the early OVAs — Ilse's Notebook, A Sudden Visitor, Distress, and No Regrets — before continuing into episodes 26-37 and 38-49. The Lost Girls OVA slots in next, ahead of episodes 49-59, and the run closes with the Final Season split into Part 1 (episodes 1-16) and Part 2 (episodes 17-29). Watching in this chronological order keeps the OVAs where they belong relative to the main timeline instead of tacking them on at the end. If you want the correct order including all OVAs rather than just the TV cut, this is exactly where each side story fits between the numbered episode blocks.