Yuki's mother, Chisato, is a single mother who divorced 15 years ago. - Chisato worked for Gamshala to raise her Yuki well, she graduated from college and she grew up to be a good member of society. - Yuki presented her Chisato with her hot spring trip for her first salary. - Chisato was really happy that her Yuki invited her to travel, but she seemed to have finished her role as a mother and she was a little lonely ...