夏川 みどり

Remarried two years ago with the father (Daijiro) of the protagonist (Satoru).
She is usually quiet, but she always cares for Satoru when he is in trouble. She is a good and reliable mother-in-law.

When she becomes naughty, she suddenly changes and overwhelms Satoru with her rich and superb techniques.
There is also a glimpse of the intriguing part in her such as instigating Satoru, who was not willing at first, and pulling him into her own scheme.