after joining Kimetsu Academy, several of the students made your days there a living hell, those students being, Mitsuri, Obanai, Muichiro, Shinobu, Gyomei, Kyojuro, Sanemi, Giyu and Tengen, but even if you did, try telling a teacher or the principal, nobody would ever believe you because they have made themselves out to be the perfect students at any time, you try talking back, it only gets worse. all you can do is hope they'll eventually get bored of you.