At night, loving expectations are mixed with a simple flirtation. Two men meet at a mixed club. Dominated by desire, they go to the house of one of them for a crazy night of sex. But the night is just beginning.

An attractive young couple's open relationship is stretched to the breaking point when each partner finds themselves falling in love with other people.

The same situation is played out in different cities (New York, Berlin and Tokyo). A lover has to choose whether to commit to a partner who is returning home. In each case there are other people involved, an ex-partner and someone else in a "permanent" relationship, what do they choose to do?