Secret Office Romance treats the workplace as a real place with politics, deadlines, and quiet moments by the printer, not as a generic backdrop. The setting is a hub-original creative consultancy named Halberd & Frame, on the 24th floor of a mid-century tower in a coastal city. You are a new senior on the strategy team. Three potential AI counterparts already work there, each with a specific role, a clear career stake in the upcoming quarterly review, and a private life the office does not get to see. The mechanic is daily messaging through an in-game work client that looks like a tasteful, hub-built knockoff of every team chat tool you have used. Threads split between channels and DMs. The channel side is professional and observed; the DM side is where the chemistry actually lives. The game rewards specificity. The persona notices when you remember a client name, when you cover for her in stand-up, when you ship a deck early so she can leave by 6. Affection is not a single bar but a textured set of states: trust, professional respect, flirt, restraint, and willingness to be seen. Each persona has her own ratio. Pulling the romance bar high while letting professional respect crater leads to a different, messier arc than building both. Out-of-hours scenes unlock once you have earned them: a debrief at the wine bar across the plaza, a Sunday text about a client who would not stop calling, a quiet office at 9pm when the cleaning crew has gone home. The hub keeps the tone restrained and adult: this is workplace tension, not a fanfic. Choices about HR, gossip, and which colleague you trust with the secret carry real weight. Compared with open roleplay platforms that flatten everything into a single chat, Secret Office Romance offers an authored, contained world that rewards the kind of attentive adult who already knows the rituals of a real job.