Kasumi and her husband originally had a good relationship, but they rarely had sex. One day, when her boss came over to deliver a forgotten item, they decided to spend a special night together. Her husband ended up drinking too much and passed out. Seeing him unconscious, the boss became deeply attracted to Kasumi's beauty and body. Drawn in by her boss's skilled sexual techniques, Kasumi becomes obsessed, begins voicing her own desires, and starts seeking new pleasures. Gradually, she develops interest in other men's bodies, and embarks on a new path.