Otto Kimmel had a long career as a confectioner. Now he is a pensioner and primarily a grandpa. In his house, where three generations live under one roof, Otto is the restless soul; this sometimes causes problems, but also brings a lot of joy. For his grandchildren, Grandpa Otto is a "fragrant buddy" because he is up for a lot of fun and initiates the craziest things. To Martha's chagrin, however, he sometimes oversteps his grandfatherly "sphere of competence". Amusing events and entanglements unfold over 75 minutes, and the "Gesellenstück" (journeyman's play) finally results in something that even Grandpa Kimmel is more than surprised by.