Sadayo Kawakami

She is a Japanese teacher and homeroom teacher of Class 2-D at Shujin Academy. She is shown to be very cautious and act coldly towards Ren Amamiya due to the fact that he has a criminal record to him and thought of him as nothing but a problem student, even going as far as asking for homeroom reassignment at first. She is symbolized by The Temperance tarot card.

She secretly works a side job as a Call-out Maid during the night, going by the alias of Becky. She and Ren make a deal to keep her maid identity a secret and in return she will help Ren in many ways like allowing him to slack off in class. Eventually, she and Ren develop a dependent friendship with each other and Ren helps her with quitting her job as a maid to allow her to restart her life as a brand new teacher.