Ichi Quadrant (Blanc Dimension)

        

"K-11 is wall to protect from enemies that invade to Ichi Quadrant"

Ichi Quadrant also known as 1st Quadrant former known as Alpha Quadrant is one of Quadrant System in Touhou Galaxy, K-11 is planet that defense space from ship entrance to Ichi Quadrant bypass from Shi Quadrant, and Tomoya as defense from Ni Quadrant.