|Japanese Seiyū||Satsuki Yukino|
|English Voice Actor||Carlee Gabrisch|
Rei is a girl with a heart and appearance as cold as ice. Of the girls in the class 1-C, Rei is the most mature one. Threatening bodily harm is Rei's way of enforcing order in the classroom with Himeko being her usual target. She is the one to put Becky in her place when she gets out of hand and also the one to lure Becky out from behind the curtain with candy after she is put the fear of God into her. Rei has the second highest GPA in the entire school and works four days per week at a Chinese restaurant. However, Rei is shown to have no artistic talent. Despite her apparent coldness, Rei is often the one to teach Becky important moral lessons. She is like a big sister to Becky. She has also shown herself to have a greedy streak as when during the school festival she purposely made it so their classroom was the most popular so that she could reap the profits later, something she was unable to do since all profits went to charity.
She has long green hair and brown eyes. She also wears glasses. You mostly see her wear the normal school uniform with black tights.