Full Metal Panic!

The Full Metal Panic! watch order spans four TV seasons — 61 episodes total — plus one OVA, and this is the order to watch them in. Begin with the 24-episode first season, then a 12-episode season and a 13-episode third season. The Full Metal Panic! The Second Raid OVA follows directly after that third season, and the run finishes with a final 12-episode season. Keeping the OVA in this spot means it lands right after the arc it continues instead of feeling disconnected from the rest of the story. If you want only the main mecha-and-military storyline you can pass on the OVA, but for the complete correct order including it, start with the first season and follow each block through to the last. That sequence tells you where to start and exactly how the OVA slots between the seasons.