Though Nana remarried, her physical relationship with her current husband is lacking, leaving her constantly frustrated and sexually unfulfilled. While her relationship with her stepson Makoto is initially awkward, they gradually begin to talk more—until one day, she notices semen stains on his underwear, stirring something deep within her. Seeing that Makoto lacks knowledge about sexual release, Nana starts helping him out with handjob and blowjob sessions. During these intimate moments, Makoto becomes increasingly drawn to his stepmother’s large breasts, eventually craving a relationship that goes beyond mere family bonds. As forbidden desires awaken, Nana can no longer suppress her own passion—her heart and body ignite in a blazing affair.