黒崎 晶

She is the main character's mother, a female teacher with a serious personality. She works at the school the main character attends.

She has a great style and is very popular among male students. Her husband died in an accident several years ago, and she lives alone with her son.

She feels responsible for raising her son well in her husband's absence, and she is somewhat anxious about him. She is also paranoid.

She is good friends with the mothers on both sides of the house, as her son has been taken care of by them for a long time.