引山 直美

The protagonist's mother. She works in the school he transfers to and insists that he call her 'sensei' when at school.

Her last name is changeable by the user.

Her husband is actually also her brother, a secret she's kept from her children making them all inbred. She's not surprised when Asuka and Hotori fall in love with their brother like she did. They are her children after all.