Yuki was born when Naoko was 20 years old. His father disappeared, and Naoko overcame the opposition of the surroundings and raised her by herself. Sometimes gentle and sometimes strict, he raised Yuki as a mother and as a substitute for his father. Because of that, Yuki got a job safely and decided to live in the dormitory. After a long time, Yuki got a consecutive holiday and went home for the first time in a long time, and Naoko took her to a hot spring trip without parent and child water.
