1girl 2021 blazer blood boxcutter brown_jacket coll_(erichankun) collared_shirt covered_mouth green_background green_blood green_eyes hair_over_one_eye holding_boxcutter jacket kusunoki_muu light_brown_hair long_sleeves looking_at_viewer milgram one_eye_covered pink_sweater red_ribbon ribbon school_uniform shirt short_hair signature solo sweater white_shirt