Mrs. Kaidou

 is the mother of Shun, Toki, and Sora.

Background
She is an intelligent woman who wears glasses and is tough, enthusiastic and disciplined when it comes to her son's education. Education is highly prioritized for her, which can be shown by her telling her kid that studying daily will get him an instant ticket to a first class university. She was once a career woman in the prime of life but turned into house-wife the moment she got married.

Trivia

 * Her husband is alive but he hasn't been seen.