Entering the Underworld

"Alright, now that everyone is here, let's begin."

Setting down the documents in his hand, Uchiha Yū strode up to the portal. Sensing waves of pressure coming from beyond it, he looked at the two beside him and said, "The next operation will be highly dangerous. Remember, preserving your own lives is the top priority. If you encounter an enemy you cannot resist, immediately return to the vicinity of the portal. Teacher Orochimaru will receive you here."

The investigation plan was divided into two parts. The three entering the Underworld would conduct the investigation, while Orochimaru, remaining in the laboratory, would be responsible for opening the portal and bringing the three back.

When purple light appeared before them, Uchiha Yū was the first to stride inside, followed by Minato Namikaze and Obito.

The interior of the portal passage was a bizarre, dazzling sight, roughly the same as what they had seen before.

"We are separated from the Underworld by only a spatial barrier. Passing through here will take us directly there."

Uchiha Yū had already activated his Mangekyō Sharingan, bringing himself to peak condition.

"What an incredible thing."

As their first time entering a spatial passage, the other two stared around them in amazement, bewildered by the scene.

"Teacher Minato, can you set up Flying Thunder God marks inside the spatial passage?"

Thinking of Minato Namikaze's abilities, Obito voiced his idea.

Hearing Obito's suggestion, Minato Namikaze immediately took out a kunai. But when he tried to place a mark, he discovered that his Flying Thunder God could not leave one. It was the first time he had encountered a place where he could not mark, and he shook his head gravely. "The space here is unstable. My Flying Thunder God cannot be used for teleportation."

Flying Thunder God was a