The eldest daughter of a rural family Mon returns home from Tokyo pregnant after an affair with a college student Kobata, which causes a scandal that will threaten the marriage prospects of the younger sister San, in her cash-strapped family. The ill-tempered eldest brother Inokichi decides to take on the role of disciplinarian, with harrowing results.
A sister (Bibi Andersson) and brother (Per Oscarsson) become lovers in this incestuous costume drama set in 18th-century Sweden. The sex-starved siblings carry on their tawdry and illicit affair at a time when moral debauchery and decadence ran rampant. The literal translation of the Swedish title is Brother And Sister Bed.