Aiko's Choice is a wonderful little bite-sized interlude mission pack that takes place between missions from the main game. Perfect if you want more Shadow Tactics. Everything that was already in the main game is also present here, which is why I like to refer to my review of Shadow Tactics: Blades of the Shogun. In addition, however, Aiko and the background of her training and old acquaintances are introduced. Nothing you really needed but as I said: More Shadow Tactics is good Shadow Tactics.

Review of the main game:
https://www.backloggd.com/u/pali/review/673227/