Asami Rena is a new secretary assigned to the CEO's office. The moment CEO Sawada saw her, he forcibly took her as his mistress. Sawada, deeply interested in BDSM, began training and dominating Rena. Meanwhile, Maekawa, an ambitious young employee who belongs to the managing director's faction—rival to Sawada's—starts pursuing Rena. Drawn to Maekawa's youth and charm, Rena finds herself emotionally conflicted. Sensing her wavering loyalty, Sawada intensifies his cruel training, subjecting her to harsh enemas and relentless domination. Caught between two powerful men, the beautiful and sensitive Rena is torn, her body and desires driven deeper into overwhelming lust.