Yumi is married to a successful company executive, living a life without want. However, her husband is consumed by work and neglects their sex life. One day, he brings home his young subordinate, Matsuda. Their eyes meet, sparking an instant tension. Later that night, with her husband passed out drunk, Yumi finds herself in bed as the hours grow late. Though she resists at first, her body's longing becomes unbearable, and she soon finds herself seduced and shared by Matsuda and his coworkers.