Natsukawa Midori

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.