|Height||5' 6" (168 cm)|
|Weight||110 lbs (50 kg)|
|Bust||48K (49") (123.45 cm)|
|Waist||22" (56 cm)|
|Hip||36" (91 cm)|
Keiko is the mother of the Shinonome children. Except to Miharu to whom she is an aunt.
Keiko is a single mother; although later she admits to Densuke that she has feelings for him despite being significantly older than him. She intially attempts to seduce Densuke, but stops after realizing that her daughter is truly in love with him.
She has a very kind and motherly attitude but can be ditzy and absent minded. Keiko is easily distracted by whatever catches her eye. During her first meeting with Densuke she had lost her wallet but was repeatedly distracted by other things.
Keiko, unlike her daughter, is not embarrassed in the least by her body and has considerably less modesty, but not to the degree of Kirika. During her first encounter with Densuke she did not even blush when he accidently groped her, and unintentionally put him in several comprimising positions (i.e hugging him from behind wearing a towel bikini, hitting the back of his head with her breasts, etc).
During the mid 1980's she was a TV idol working under the name 'Hoshino Jun'. However she eventually quite the limelight as there wasn't a high demand for big breasted women. She eventually settled down with a husband and had six children.
Her first encounter with Densuke mirrored her daughter as he accidently collided with her and accidently felt her up. Unlike Chiharu's encounter Keiko understood it was an accident and introduced herself. They went looking for her missing wallet and Densuke found out she was Chiharu's and Yuriko's mother (as well as the idol from the picture he had been ogling).
- She is introduced in Volume 14.
- As the manga was released in 2001, that would make her 31 years old, meaning she had Chiharu at a young age.
- She has the largest bust in the family and the series at 123.45 cm, but said that they were about the same size as Chiharu's at her age. In the same picture which showed this also revealed she was Chiharu's age in 1985.