Sae Chabashira is a Japanese history teacher and the assigned homeroom teacher of Class D. She's also handling the same section on the 2nd Year Arc. Sae is a young woman with long brown hair that is tied in a ponytail with bangs swept to the left, brown eyes, a well-endowed voluptuous body. She is mostly seen with a serious expression on her face, although it does change into a smile on rare occasions. Her normal outfit consists of a black blazer with a white polo shirt underneath, a short black skirt, stockings and a pair of black heels. As a teacher, Sae is very serious about her job. This was shown when she still made the effort to teach her class although most of them were not paying attention to her lesson. She follows the school rules to the letter which is shown when she bluntly told Ken Sudō that he would be expelled from the school for failing the test. She isn’t attached to her class and only does the bare minimum in aiding them in their endeavours. She prefers to let them fend for themselves and wouldn’t go out of her way to assist them even if they request her assistance. With that said, a few students have caught her eye and made her job more fun than it otherwise would have been. She has subtle sadistic tendencies and sometimes shows them in public such as when she called her students disappointing after informing them that they wouldn't receive points after they idiotically blew through them in a month and took joy in their anguish and perplexed expressions. She also demanded a large sum of points from Kiyotaka Ayanokōji as part of his deal to prevent Ken from being expelled. She did this because she knew that he didn't have the amount to pay for such a thing and was curious to see what he would do next. Despite her sadistic tendencies, she has shown some leniency towards the class as well. She gave subtle hints as to why she wasn’t punishing students who were either sleeping or playing on their phones but none of them realized that each of their blatant disregard of the rules were being captured. She was also willing to rescind Ken's expulsion after Kiyotaka and Suzune Horikita upheld their end of the bargain to halt their classmates' fate, showing that she is at least honorable to her word. She seems to have taken an interest in Suzune and Kiyotaka, as their selfless deed was something she had never seen at the school and wasn’t expecting such an outcome from a class she deemed worthless. She appears perceptive, as she was able to recognize the depths of Kiyotaka's intelligence and figure out that he was hiding his talents on purpose as he wouldn't be in the lowest ranking class if he was that amazing. She tried blackmailing him to reach Class A after his father requested that he be expelled but he refused to succumb to her threat. She is shown to approach most things indifferently as shown when she was unfazed by Kiyotaka grabbing her by the collar after she ordered him to reach for Class 1-A, not punishing him after the ordeal either. She was also amused by Kiyotaka's refusal to comply with her and his father's wishes to advance even though she previously threatened to expel him According to herself, she has lived a life full of regrets implying that there were some terrible events that transpired some time ago. She has been seen smoking a cigarette when by herself, using it as self-medication to reduce her stress. She does give praise when praise is due such as when Kiyotaka played a perfect mellifluous piece on the piano which she admits that even when given a lifetime, she wouldn’t be able to reciprocate such a breathtaking feat that he did so effortlessly.