Definitely a girl. The chest armor + blushing at his body + same reactions as the other girls when it came to the snake. Not to mention I believe she was described as firey or something.Just look at the poses and flowers that showed up when the women were introduced, and the random boob fanfare with how he landed on the teacher. Plus the fact he was like I’m gonna kick the professors a** and then was like wow pretty never mind. Has all the stereotypical harem members, older mature professor hottie, big tiddy cute one hottie, firey hottie who’s gender is neutral but definitely is a woman and is going to have random fanfare and cute scenes, and ice cold arrogant beauty. 95% chance this is harem and blondie is probably going to be the main harem chick. I’m dropping before I waste my time.
All that’s left is the stereotypical flat chested silver haired or red head chick who is tsundere or emotionless.
I'm still early in the chapters, but the story do seem to like skipping parts of the story and to make it convenient, like there'll be a flashback.
Still don't know if the blonde knight is a boy or a girl. Might drop it if the classmates do take interest on the MC and get annoying.