1girl, ahoge, alternate costume, backlighting, black coat, blurry, book, book stack, bookshelf, coat, collared shirt, demon girl, demon horns, depth of field, forehead, hair ornament, hairclip, halo, holding, holding pen, horns, indoors, leaning forward, long hair, long sleeves, looking away, necktie, office, paper, parted bangs, pen, pointing, ponytail, purple eyes, school uniform, shirt, sidelocks, sitting, solo, white hair, wind, writing