Ten years after giving birth to her eldest son and daughter, her second son, Showa, was born. Being so much younger, the child held a special place in his mother's heart, and Yumi doted on Showa above all. They shared a close bond, spending every day together. While her husband was away on a long business trip, middle-school-aged Showa and Yumi began living together like lovers. Even now, he has no intention of dating other women, and she has no plans to let him marry anyone else.