Shiori Tsukada, a voluptuous and big-breasted widow with a big ass, lives harmoniously with her stepson Tomifumi and daughter-in-law Sakiho. During a weekend when Sakiho leaves for a friend's wedding, Tomifumi, driven by alcohol and long-suppressed emotions, confesses his feelings for Shiori. He reveals that from the moment they first met, she reminded him of his first love, and he passionately makes his move. Despite the loneliness and emotional scars left by her husband's death, Shiori gradually responds to Tomifumi's advances, opening her heart and body to him.