Kurumi struggles with her studies due to an insatiable libido inherited from her mother and sister. When a handsome private tutor is hired to help her, Kurumi quickly transforms her biology lesson into a carnal encounter. The family's lack of inhibition extends beyond the home, as Kurumi and her mother later seduce a taxi driver, fully embracing their shared nature as a family driven by pleasure.
Souma Kurumi struggles with her nymphomaniac mother, Mitsuko, whose blatant promiscuity permeates their home. Simultaneously, a new employee named Mesu Naoko joins a company where the manager, Souko, provides "professional training" that consists of sexual favors for male coworkers. Naoko quickly adapts to this unconventional workplace culture, viewing her sexual encounters as a way to excel in her new career.