Housewife Umiko suffers from loneliness as her husband constantly comes home late. Night after night, she prepares dinner and waits in solitude, her isolation driving her to the edge. Seeking comfort, she begins sleeping together with her son. Though they were once an ordinary mother and son, their relationship takes a sudden romantic turn. The mother becomes aroused as her son sniffs and licks her smelly anus. Stimulated anally, she feels the urge to defecate and forcefully expels thick, hard, extremely large feces onto her son's face. This shocking act gives rise to a new, taboo relationship.