User blog comment:IamJakuhoRaikoben/Chapter 468: Memory of the Stars, Review./@comment-67.5.230.127-20160109210531

Hey guys I went to go see the picture of Anna holding the key so I checked and it turned out to be Libra's key, so it turns out that she was most likel Libra's former owner (and possibly the other gold keys as well considering the Eclipse Gate requires all 12 or apart of your life force to open it).