Mrs Ikaruga

Mrs Ikaruga is Hoji Ikaruga's wife. It's unknown that she is Keiji and/or Sayo's biological mother or not.

Appearance
10 years ago, she wore a kimono and had short hair parted in middle. Later when Sayo was older, she appeared to wear a black shirt and her short hair is with bangs. (It's unknown whether the two appearances are the same person, though)

Plot
In a flashback of Shimon, she appeared as watching TV with Hoji, and asking Shimon to see whether Sayo has fainted at bathroom.

In another flashback of earlier time, she asked Shimon that if he was alright, for Shimon didn't have the appetite, thinking about Tenma.