A must-watch for AOT fans. This 3 episode OVA focuses on Annie and Mikasa and adds more back story and motivations to both characters. No spoiler synopsis: Annie's episodes focus on a detective case of a missing girl, and we get to see her backstory and motivation for why she wants to capture Eren. This backstory also shows the dark underbelly of their walled city, which we don't see much of in the anime. The only problem is it was too short and not flushed out enough. While Mikasa's episode shows her reason for wanting to follow Eren and why she sticks by his side. It's notas simple as portrayed in the anime and runs a lot deeper. I think this segment of the story is essential to gain a better understanding of Mikasa's character and motivations.
Like Annie's story, the main problem is this 3 episode OVA is too short; thus, the pacing feels off/rushed.

Overall, it's a solid addition to AOT's lore, and I would highly suggest it.
7/10