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Robby (Dani Levy) has a girlfriend, Henny (Anja Franke). Returning from a business trip to Japan, he finds that his roommate Kalle (Frank Beilicke) has seduced her in his absence, and that she has moved into their shared apartment. Robby's emotional disarray is too much for the new couple, and Henny moves out. The two men take on a new roommate, Paul (Josef Hoffmann), who is smitten by one of his female coworkers, Tilla (Nina Schultz), who in turn is attracted to Kalle. The elaborate romantic strategems and chest-thumping rivalry of these three men provide much of the comic material for this film.