When Minako was 20, she had been involved with a married man who already had a wife and child. When he learned that Minako was pregnant with his son, he desperately begged her to have an abortion, but she refused and vanished to escape his sight. She gave birth to Hiroaki alone and raised him as a single mother. As her son grew, she began to notice his increasing resemblance to his father, rekindling the feelings she once had for the man. Eventually, the two crossed the line and started spending every night together. To celebrate Hiroaki's 20th birthday, Minako planned a hot spring trip, but as the date approached, she found herself torn between continuing their relationship or choosing a new path forward.