Under the watchful eyes of Naruto and Mui, as well as Soji and Ryūzetsu hidden in the shadows, the Box of Paradise originally looked like a massive cubic chest.
Now, after absorbing Naruto and the Nine-Tails' Chakra, strange black smoke began to seep from its surface.
Combined with the blood-red glow in the eyes of the enormous stone faces on the Box of Paradise's four sides, it looked as though some monster was slowly awakening.
This sight would probably scare plenty of ordinary people and weaker ninja to tears!
"Rumble, rumble..."
When the final trace of Chakra belonging to Naruto and the Nine-Tails was completely absorbed by the Box of Paradise, the entire laboratory began to shake.
"Bang! Bang! Bang!"
As though struck by a magnitude-eight earthquake, the lights in the laboratory went out one after another amid the violent tremors.
Then chunks of the stone pillars in the dome began falling.
If nothing unexpected happened, the entire underground level of Hozuki Castle was about to be destroyed.
If they did not get out soon, everyone still underground would be buried alive!
Of course, they might also be crushed to death...
"Crash..."
"Wooo..."
The concrete walls surrounding the Box of Paradise began crumbling away bit by bit as though they were made of rotten tofu.
Beyond that, an even stranger sight appeared!
The four stone faces on the Box of Paradise, which originally represented joy, anger, sorrow, and pleasure, had all raised the corners of their mouths after absorbing Naruto and the Nine-Tails' Chakra!
The stone faces had changed expressions!
Anyone unaware of the truth might have thought those four stone faces were alive.
Yet in reality, those stone faces had undoubtedly been lifeless objects before.
Now, all of them wore the same expression.
It looked like the smile of