秋津 祥子

Yuki's biological mother and Naoki's ex-wife. Yuki calls her "mama". She has a laid-back and calm personality but holds strong convictions.

She used to work as a receptionist at Naoki's company and is a very beautiful and stylish woman.

She became a little overweight because she was a housewife after her marriage. She has a plump body and big breasts. After her divorce from Naoki, she moved to a nearby apartment and works part-time as an office worker.

She is good friends with Naoki's sister (Saya) and his new wife (Yuriko) and sees them frequently.

She run's "yuuki-kun's mama club" and keeps it under wraps.