"What's visualization?" Diana asked instead of answering Sadou's question.

"Visualization is... Come with me..."

Sadou exited the psychic world as he spoke, and Diana immediately followed suit.

In the real world, the two of them were situated in an underground chamber.

"Come with me."

Sadou led Diana deeper into the underground chamber before arriving at a door.

The room that the door was attached to was clearly no ordinary room. Both the door and the walls were constructed from metal, and Sadou's fingerprints and pupils both had to be scanned before entry was granted.

"This is my visualization chamber. Visualization requires an extremely high level of concentration, so you need to take measures not to be disrupted during the process."

After the...