Arknights: A1 Operations Preparation Detachment

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