One day, my son got married and brought a new member into our family. I learned that his wife, a young and gentle woman named Rio, had become part of our household. At 26 years old, she was youthful and elegant, instantly captivating me with her grace. One night, as I passed by my son's bedroom, I noticed the sliding door slightly ajar, and their conversation drifted out into the hallway. After overhearing what they said, my family's everyday life changed forever...