It was a sudden confession, and when Kozuka embraced her, Mariko was confused, but at the same time, she was a little happy as a woman. However, Kozuka was a friend of her son's, whom she had known since childhood. This was not an acceptable relationship. She tried to Kokoro down and somehow resolve the situation smoothly, but... "I had already decided that Mariko would be my first partner!" Moved by his pure words, Mariko resolved to be his first woman. She whispered softly in Kozuka's ear, "This is our little secret."