In 1935, in the Burgundian village of Valromey, Commissioner Desbordes was the very unpopular leader of the anti-alcoholic league. His own brother, Pimpin, is an unconditional defender of the vineyard. Pierre Moreau is, for his part, the representative of a hygienic drink, the "Koku-Kolu". The cafe owner's daughter, Rose, will find the man very to her liking and will manage to seduce him.