And, just as before, part of the wall across from them slid open in a way it shouldn't have been able to, and there was Yachiyo-sensei to greet the pair. One quick, confirming glance, and she nodded to herself.

"I'm glad you both could make it. Follow me. I'll explain when we're inside."

And back she went into the passage, lit as before by the pale blue lights and nothing else.