Code Geass fans know Akito as the spinoff that actually committed to its premise instead of retreating into fanservice. This special is a continuation of that, deepening character relationships through dialogue in a format that forces you to listen instead of watching mecha choreography carry the narrative weight. The picture drama format strips away spectacle. What remains is raw character work for a show built on tactical intrigue and the cost of using people as chess pieces. If you watched Akito and wanted to understand these characters better, this gives you that without asking you to wait for another full season. If you haven't seen Akito yet, this isn't a starting point, it's a reward for already being committed.
Code Geass: Boukoku no Akito 2 - Hikisakareshi Yokuryuu Picture Drama is a 2013 mecha special from Sunrise.