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.