Yuki was born when Seika was 18 years old. Seika raised Yuki single-handedly. In order not to make her feel sorry for her, she quit college and worked late into the night and worked non-stop. Thanks to her, Yuki was able to go to college, but she always felt lonely. When Yuki turned 20, she decided to consume the paid leave accumulated in Seika's pool, and went to a hot spring inn with her parent and child. However, Seika was thinking only about her work.
