matsuo yukihiro, seira orgel, blood tune, chaos;head, science adventure, shiny eyes, game cg, non-web source, official art, 1girl, ahoge, black serafuku, black shirt, black skirt, black socks, blush, breasts, brown hair, collarbone, cropped shirt, facing viewer, hair over shoulder, high-waist skirt, kneehighs, long hair, long sleeves, looking at viewer, miniskirt, narrowed eyes, necktie, open mouth, pink necktie, pink trim, pleated skirt, purple eyes, sad, sailor collar, school uniform, seira orgel (pre-transformation), serafuku, shirt, skirt, small breasts, smile, socks, solo, star (symbol), star print, thighs, tongue, transparent background, white sailor collar