E-girls announced their second album before the release of "Diamond Only". The album's covers, track list and release date were later confirmed after the group released the PV for the album's promotional single, "RYDEEN ~Dance All Night~". The album features five previously unreleased songs, including pre-released single "RYDEEN ~Dance All Night~", while the rest of the album featured songs previously released as singles or b-sides. The album also includes a Rock Version of the group's single "Follow Me" from their debut album, "Lesson 1".

Three songs from the album were released as official singles, with one promotional single:

The album debuted at number one on Oricon's Weekly Chart with 89,766 copies sold in the first week and has been certified Gold by the RIAJ.

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Wikipedia