ephemera is ryuryu's first album. It contains 12 tracks, all sung by Hatsune Miku. It was first released by KarenT, and later redistributed by the circle s10rw. Tracks 1, 6 and 12 are new.
A crossfade of the album can be heard on Nico Nico Douga.
The s10rw album is puchasable on Toranoana.