Bijou's Pebble Cave was officially formed around 2023. It is dedicated to representing and supporting Hololive Advent's Sparkling Gem, Koseki Bijou.
Bijou's Pebble Cave can be accessed through the Advent Prison's waypoint (-5162, -22105) and via the small railway system to the cave, which is not currently connected to the greater server railway system.
[WIP]
There is no known representative in Bijou's Pebble Cave as of now.