izumi sai, patchouli knowledge, touhou, bad id, bad pixiv id, highres, 1girl, alternate hairstyle, bare shoulders, barefoot, bikini, book, bow, breasts, cleavage, crescent, crescent hair ornament, female focus, hair bow, hair ornament, large breasts, long hair, looking at viewer, lying, on stomach, open mouth, pink bow, ponytail, purple eyes, purple hair, side-tie bikini bottom, solo, striped bikini, striped clothes, swimsuit