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, necktie, open mouth, pink necktie, pink trim, pleated skirt, purple eyes, sailor collar, school uniform, seira orgel (pre-transformation), serafuku, shirt, skirt, small breasts, smile, socks, solo, star (symbol), star print, surprised, thighs, tongue, transparent background, white sailor collar, wide-eyed