noba, pixiv fantasia, pixiv fantasia 4, 1boy, 1girl, animal ears, armchair, blue eyes, book, bookshelf, boots, brown eyes, cat ears, chair, cup, disposable cup, fingerless gloves, fur trim, gears, globe, gloves, hat, holding, holding book, holding cup, hood, hood down, indoors, long sleeves, mountain, mug, night, open book, planetarium, poster (object), reading, robe, sash, scenery, sitting, sky, standing, star (sky), star (symbol), starry sky, steam, telescope, white hair