Pierrot is madly in love with his girlfriend Marianne, but Marianne feels bored and stifled by the dull middle-class life. To escape this monotony, Pierrot follows Marianne as they run wildly to the south, to the sea, seeking a life of freedom. However, beneath their carefree lifestyle lies a hidden emotional crisis. The two grow further apart, their relationship becoming increasingly distant. Marianne insists on returning to a place where there's more life — somewhere she can sing and dance — and she insists on finding her "brother," who is actually her real lover. In the end, Pierrot kills Marianne, paints his face blue like a mask, straps explosives to his body, and detonates them, reuniting with Marianne in an eternal love.