izumi sai, highres, official art, 1girl, :o, animal ears, arm up, armpits, birthday, blush, braid, breasts, character name, cheering, cheerleader, collar, cowboy shot, crop top, crown braid, dated, english text, hand up, happy birthday, holding, holding pom poms, jingai kyoshitsu no ningen girai kyoshi, looking at viewer, midriff, miniskirt, navel, open mouth, pink collar, pink hair, pleated skirt, polka dot, polka dot background, pom pom (cheerleading), pom poms, red eyes, short hair, sidelocks, skirt, solo, standing, sweat, usami sui, white skirt