Epsilon (stylized as εpsilon) is Blood Stain Child's fifth studio album and first release on Coroner Records/Pony Canyon. It's also the first and only album to feature vocalist Sophia and drummer Gami (after the departure of vocalist Sadew and drummer/founding-member Violator). All compositions—except "Electricity," which is composed by Aki—are by Ryu, while lyrics are co-written by Sophia.[1] This album was pre-sold during A-Kon from June 10 to 12, 2011.[2] And, in this event, nine of the new songs (including the European bonus track, "Royal Sky") were performed.[3] As of June 7, 2011, Pony Canyon released forty-four second samples of each song in the album;[1] a full sample of "Sirius VI" debuted, through Internet radio, on May 26, 2011.[4]
