1girl, o, ball, basketball_hoop, black_skirt, black_socks, blue_socks, blush, brown_eyes, brown_hair, clenched_hands, collared_shirt, dated, desk, exercise_ball, gym, hair_between_eyes, hair_ribbon, hairband, indoors, kneehighs, kobayashi_chisato, long_sleeves, looking_at_viewer, mattress, original, panties, pantyshot, plaid, plaid_skirt, pleated_skirt, pom_pom_(cheerleading), ribbon, shirt, signature, sitting, sitting_on_ball, skirt, socks, solo, thighs, underwear, white_shirt