Third(?) in a series of three history albums celebrating the former bands of Mother vocalist youna (優薙-youna-). This version collects tracks from Mercuria.

In the description of a YouTube video (since deleted) advertising this release, it was mentioned that the release was postponed. It's unclear if the CD ever actually came out.

The first history album (for Shigure (時雨)) was delayed, and the fate of the second history album (for Kaede (楓)) is unclear. This album has several tracks that seem to have also been planned for the Kaede (楓) history album, but that might simply be because several Mercuria songs were covers of that band. Or it might be that the Kaede (楓) album was scrapped and some of its planned contents were reused for this one. Details are unclear.