Since Kana's husband earned a promotion and became consumed by work, the married couple has barely had sex. At an age when her desire is peaking, Kana finds her body growing increasingly sensitive. One day, her husband's subordinate Kawagoe arrives at their home drunk after being made to drink with his boss. As Kana cares for him, their bodies press together and her nipple is accidentally rubbed, making her moan. Fueled by alcohol and resentment toward his boss, Kawagoe begins training her nipples with a forceful persistence.