plana (blue archive), blue archive, absurdres, commentary request, highres, 1girl, :o, black hairband, black pantyhose, black serafuku, blush, bottle, cropped shirt, fingernails, full body, grey hair, hairband, halo, heart, heart halo, high-waist skirt, holding, holding bottle, long hair, long sleeves, looking at viewer, neckerchief, no shoes, pantyhose, pleated skirt, rei hinasuki, school uniform, seiza, serafuku, simple background, sitting, skirt, solo, straight hair, very long hair, water bottle, white background, white neckerchief