Rule 34 Dev - 1girl blue_eyes blue_hair blush book cosplay crescent crescent_moon female_focus hair_ornament hairclip hat hiryukai hiryuu_kai_(hiryukai58) idolmaster idolmaster_dearly_stars matching_hair/eyes mizutani_eri moon open_mouth patchouli_knowledge patchouli_knowledge_(cosplay) short_hair smile solo touhou|2207459007