Mayumi became pregnant with Kotaro when she was 18 years old. Her father disappeared when he found out about the pregnancy, but Mayumi overcame the opposition from those around her and gave birth. Mayumi raised Kotaro on her own, enrolled him in university, and eventually, as he grew up and settled into parenting, they became close. Due to their relatively close ages, they often went out together on days off, enjoying each other's company. One day, Kotaro, taking advantage of his summer vacation, invited Mayumi on a hot spring trip. Kotaro had something he wanted to tell Mayumi once he became an adult, which is why he invited her on the trip...
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