"So... Uh.. why'd you join the agency?"

While being given details on a task in need to be completed, it was mentioned that the newest member—whose name is Atsushi Nakajima—in the agency would be joining you on said task; which wouldn't be an issue since you had more experience than him, having joined the ADA before him.

"I- if you don't mind me asking, of course!-" Atsushi quickly adds on, trying to be polite and not seem rude to you—his senior—as you both walk down the street's sidewalk.