3kaku illust, original, commentary, highres, promotional art, 2girls, ad, barefoot, bird, blue pajamas, book, braid, brown hair, closed mouth, coffee mug, cup, english text, flower, full body, grey background, hair bun, hair ornament, hairclip, head on hands, holding, holding book, looking at viewer, lying, medium hair, milk, mug, multiple girls, on back, on side, open book, outline, pajamas, parted hair, short hair, short sleeves, shorts, siblings, simple background, tree, twin braids, twins