kamonari ahiru, cirno, hakurei reimu, tombow mono, touhou, 2girls, ahoge, ai ai gasa, alternate costume, bad math, black border, black hair, black thighhighs, blue dress, blue hair, blush, book, border, bow, brown eyes, chair, closed eyes, contemporary, desk, dress, eraser, hair bow, hair ornament, hairclip, heart, heart ahoge, holding hands, interlocked fingers, math, multiple girls, pencil, red dress, shoes, short hair, simple background, sitting, sleeping, the answer is 9, thighhighs, yuri