C71 Never relax!

Suddenly, I heard a dull 'kacha' sound coming from the interior of the huge door. Then, I could take out my hand. The giant door slowly opened by itself, and I quickly dodged to the side, in case there was something guarding the door.

My caution didn't work. Nothing appeared when the door was opened. I stuck my head out and looked inside. The scene before me stunned me.

Surprisingly