Mizuiro no toki Season 1 Episode 21 Episode 21 ( Air Date 1975-05-21 ) Genre Family, Drama category. Overview "The 15th NHK Asadora. Starring Shinobu Otake in a story about a young woman striving to become a doctor and her mother, who is a nurse. The first six-month Asadora. Average rating of 40.1%.".