Mei Momozono is the blonde assistant of Mouse in the series.

She is an extremely well endowed female computer and physics expert, who works at the college's physics department as a math teacher. She had been trained since childhood to be the servant to Sorata, but decided that she wouldn't follow Mouse blindly until she saw him herself, even planning to kill herself if she was made to follow a man she didn't respect. She’s Zach’s blonde aunt which gives him tons of love and affection.