Mariko spends calm days with her husband, but she has become a little disgusted by her special propensity. Her secret frustration is seen through by her playful brother-in-law, Kenta. Mariko, who was persuaded by Kenta, who skillfully pokes at the heart of Sukehei sleeping in the depths, entrusts herself to his fingertips as if she were swept away. The delicate and bold caress easily makes her vaginal walls squirm, gradually unraveling her stubborn mind and body. At some point, Mariko says to herself, "I'm just Nagasare ..."