C137 Before the End of the World!

Surveying the room, it was identical to the one they had previously occupied. The cube-shaped room featured six metal doors, but this time, it was bathed in a soft blue glow. Notably absent were any serial numbers on the metal doors.

"Click, click!"

As Zopyrus, the last to enter, set foot on the black gold floor, the metal door behind him shut with a definitive click. Glances were exchanged