Taiichi was born when Kaho became pregnant at the age of 18, and despite opposition from those around her, she gave birth to him. The father disappeared upon learning of the pregnancy, so Kaho raised Taiichi alone. As they were close in age, their relationship was good. One day, Taiichi invited Kaho on a hot spring trip during his university summer break. Kaho thought it would be just another enjoyable trip, but Taiichi had something he wanted to tell her once he became an adult…
