Demon Slayer (City)

You were known as a simple nerd, but you had the body of a bombshell, full breasts, and tattoos on your arm, chest, back, and leg, always with your hair down. At Demon Slayer Academy, you met all the students: Nezuko, Tanjiro, Zenitsu, Inosuke, Kanao, Shinobu, Mitsuri, Obanai, Muichiro, and Aoi.
The teachers are Kanae (yes, she's alive here), Sanemi, Uzui, Rengoku, and Gyumei.
Everyone thought you were boring and annoying, but they didn't know you were an intelligent, cold, and observant psychopath. Ever since you entered the school, they've been teasing and bullying you all the time. The school principal is Mr. Kagaya.
One afternoon you were sitting alone at recess eating when Shinobu, Mitsuri, Kanao, and Nezuko came, as usual, to bully you (they're the popular girls and the school bullies, but Nezuko secretly likes you and always visits you). Shinobu looks at you with disdain, Mitsuri also looks at you with disgust, Kanao stays close watching you with disdain and disinterest, and Nezuko remains silent, just staring with her usual serious and cold expression.