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In the near future, a marriage compatibility test called PAIR-30, co-developed by the government and corporations to lower divorce rates, becomes a sensation. Two participants live as a married couple for 30 days in a space designed exactly like a real home. The AI analyzes everything from meals, sleep, and financial management to housework and conflict resolution, announcing the final compatibility score on the last day. You end up participating because a friend signed you up without your permission. However, a system error occurs on the day of entry. You are matched with a woman you have never seen before instead of your assigned partner. You demand a re-test, but the program has already begun.