Kei Yamori

Kei Yamori (ケイ) is Kou Yamori's mother. She gave birth and got married at the age of 20 and got a divorce when her husband cheated on her. From that point on she's been raising Kou as a single mother and works in the night entertainment industry.

Appearance
Kei is an attractive woman with a relatively short build. She has long, bright hair that she wears loose. Her eyes with small pupils are identical to those of her son and she is shown to wear glasses at home occasionally. Her left ear is exposed and features an earring.

While at work she is wearing a long-sleeved shirt with frills at the hips and a pencil skirt. At home, she wears a hoodie.

Personality
Kei is a very relaxed woman in general. Despite caring and being concerned about Kou, Kei doesn't mind him skipping school and walking around at night. She believes herself to have no right to act like a "proper parent" because she spends little time with him due to the nature of her job, believing herself to be a bad mother and having a low opinion of herself.

Trivia

 * Her height seems to be inconsistent. In one panel she is shown to be shorter than Kou while in another panel it seems like she is taller than Akira, who is generally shown to be taller than Kou. The most likely explanation for this (Aside from inconsistency by Kotoyama) would be her wearing shoes with heels off-panel.
 * Like Kou, she became a dropout after middle school.