Arknights: A1 Operations Preparation Detachment summary:

Rookie members of the Columbia garrison, Fang, Beagle and Kroos have been posted to the commercial city of Tkaronto’s Infected district for their internship. Although it’s crowded and has quite a complex situation, the three of them resolve to do their duty to the fullest, quickly integrating with the local Infected. Soon, their six-month internship will be over, and the three of them will become full members of the garrison, but meanwhile a Catastrophe silently descends on Tkaronto…