A love affair blossoms between middle-class tool factory employee Jochen and office advertiser Marion.

Jochen's grandmother Oma searches for an affordable apartment to share with Gregor, a gentleman she picked up in a park. When Oma comes across an abandoned library space, she and Gregor decide to become do-it-yourself squatters and turn it into a kindergarten.

After the death of the foreman, the tool factory comrades hope that Franz will get promoted. However, tensions rise when the manager instead brings in an outsider.

Following a visit from Marion's strict mother, Jochen is pressured into proposing. Meanwhile, growing strained relations between Monika and the overbearing Harald start Monika on thoughts of divorce.