Karl meets Nini at a Berlin train station: it is love at first sight. But the few hours they spend together before she travels back to Vienna end in a mishap in which Karl loses her phone number. He decides to move to the Austrian capital to find his dream woman again.
It's summer and very hot in Germany's only open-air swimming pool for women. There, women bathe topless, in a bikini, bathing suit or burkini. Each follows different rules. This always leads to friction, which the overwhelmed lifeguard is not quite able to control. When a group of completely veiled women enthusiastically discovers the women's bath for themselves, rags literally fly: Who owns the bath and who makes the rules? Who owns the female body? And when is a woman a woman at all? The lifeguard resigns, exasperated. But when a man of all people is hired as the successor as lifeguard, the situation escalates in unpredictable directions.