When you open the window, you can see the Kanda River. In a 4.5 tatami room apartment, a married woman learns pleasure... and love. A school teacher calls Yuna, the mother of one of his students, to tell her something. He approaches Yuna, who is confused because his weakness has been discovered, and thrusts his tongue into her trembling lips and forcibly kisses her deeply. She refuses, saying, "I have a husband, so I'm in trouble!", but he pushes her down and roughly caresses and fingers her, making her cum! Furthermore, he inserts a stiff cock deep inside her, and she reacts sensitively many times, twisting her thin body! Yuna despairs as hot milky liquid drips from her hairless pussy. "Please keep this a secret..." Even so, Yuna refuses to leave the teacher's shabby apartment, and her love for him deepens.