A straight teacher, married with two kids, falls head over heels for a new male colleague. They begin the titular unusual affair.

Jochen Wenzel, a young teacher, married with two kids, one day surprisingly falls in love with a young male colleague, Tom Leuthner and they begin an unusual affair (= "Eine aussergewöhnliche Affäre"). While Ina, Jochen's wife, worries about Jochen's distanced behavior without having a clue of her husband's affair, Jochen and Tom seriously fall for each other. Torn between his family and his new love, Jochen has to make a decision.—Smoothhoney