![1girl bare_shoulders black_hair cover cover_page detached_sleeves expressionless from_side fuukadia_(narcolepsy) hat kourindou_tengu_costume looking_away no_panties profile red_eyes shameimaru_aya short_hair solo thighhighs tokin_hat touhou white_legwear rating:s score:15 post #1765443](/cdn_image/preview/0c/49/0c49b773bad239cf7169c622864083f4.jpg)
Japanese title: 悠久からの追憶
Seems to be a Pixiv manga adaptation of post #1600427 (which is a doujin light novel.)
Sample of the original light novel can be read here:http://www.pixiv.net/novel/show.php?id=3186842
Series largely revolves around Aya and her relationships with Hieda no Amu and Hieda no Ashichi.
Eventually released on C86 and C87.