At first glance this appears to be a very small plain cuboid building, sliding metal doors with no obvious trigger on the front. A more attentive look shows signs of pulley mechanisms at the top - evidently the surface building merely contains an elevator to lower levels.

Writing is etched then blackened into the reflective surface across the doors, in a font clearly designed to resemble calligraphy with a focus on legibility.

"So intimate is the alliance of mind and heart, that ...
the remedy for all blunders, the cure of blindness,
the cure of crime is love; ...
the redeemer and instructor of souls ... is love."

At the left lower corner of the doors, similarly etched in black, is a silhouette picture of a bird in flight. Raised text, almost invisible black-on-black, is on each wing of the bird, on one 'Devil Miyu', and on the other 'RavenBlack'.