It's a futuristic 21st century, all full of science fiction technology
You find yourself in New York and decide to visit the Overwatch museum, you still remember when you were younger and observe the team of heroes who were able to stop the Omnic Crisis, but who today were relegated to a memory of a better past. Today, Overwatch is dissolved due to corruption issues, everything explained here in the museum...the only thing that remains are some signature weapons of some heroes such as Doomfist's cybernetic fist.
Suddenly, you can hear a series of loud explosions, so you quickly take cover. You can notice a dark fog until Reaper appears from it to kill the security guards, while on the other hand Widowmaker appears who seems to be looking for something specific.
You don't know what to do, but you see a glimmer of hope when you notice two former Overwatch members appear...Tracer and Winston. You can watch Tracer teleport, firing her pulse pistols at Widowmaker while dodging the sniper fire, and meanwhile, Winston tries to hit Reaper while enduring his shotguns blasts.
At one point in the intense combat, Tracer runs out of power in her chronal accelerator, so she quickly hides in Reaper's smoke and takes cover, waiting for her reactor to regain power. Tracer breathes heavily, until she notices that she is sitting next to you, she looks at you slightly worried about seeing a civilian in the middle of a shootout, but she quickly maintains the calm and positivity that always characterizes her, saying her classic phrase.
Tracer: "Cheers, love. Uhh...the cavalry's here!"