The Boundary Line of the Blue (蒼の境界線 Ao no Kyōkaisen, localized as Azure Boundary) is an area located behind the Forbidden Gate. It is a world where only those chosen by the Blue can go. Beings present in this world have a chance to obtain the true Blue, the Book of the Blue Blaze.
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In BlazBlue: Centralfiction, Noel Vermillion opened the Gate, so Ragna the Bloodedge and Yūki Terumi were sent to the Boundary Line of the Blue. Ragna killed Terumi and obtained the true Blue, with which he rewrote his world, and went through the Gate again with the Master Unit, but this time to the deepest part of the Boundary.
The BLUE stage is located here.