Returning home for her wedding, Komatsu An reunites with her former lover Mei Kamisaka, a junior from her school days with whom she once shared a lesbian relationship. Although Mei is now married as well, seeing each other again stirs up long-buried emotions and rekindles a passionate spark. Sensing An's inner turmoil, Mei deliberately begins to seduce her. Tired of the mechanical, duty-bound sex with her husband, An awakens to pleasures she never experienced with men. She surrenders her body to Mei, finding complete liberation—both emotionally and physically. Their lips entwine in fiery, passionate kisses, exchanging saliva as Mei's expert cunnilingus and skillful toy play send An into repeated, mind-blowing orgasms. The ecstasy feels like a revelation, as intense as the first time. When Mei whispers, "If you get pregnant, let's raise the baby together on our breast milk," An's heart trembles once more. Under the guise of fertility training, An submits to abnormal games—wearing paper diapers, treated like a baby, indulging in lewd, depraved fantasies. As their emotions intertwine, a new relationship begins to bloom between them.