"ワン★オポ！vol.04" is Wonderful☆Opportunity's album, with the previous being Wonderful★Opportunity! vol.03. It consist of 10 songs, both new and old. It was first distributed at THE VOC@LOID MASTER 15, and is available on Toranoana.
A crossfade of the album can be heard on Nico Nico Douga
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