User blog comment:Emuei/Original Sin Story: Complete Edition Booklet Translation/@comment-25932613-20150824004401/@comment-67.66.95.102-20150824194244

By "complete" he refers to a complete collection of songs. The songs for OSS are done. If he makes more, then he's negated this being the "Complete Edition" of songs. And no, "Complete Edition Plus" doesn't change that.