When Asahi was 18, she got pregnant and gave birth to Tatsuaki. The father vanished, and Asahi raised Tatsuaki alone, even sending him to university. Because they were close in age, their relationship was good, often going shopping or traveling together, more like friends than parent and child. One day, Tatsuaki invited Asahi to a hot spring during winter break. Asahi looked forward to the trip as usual. However, Tatsuaki had something he wanted to tell Asahi once he became an adult, which was why he invited her on the trip…
