3,700 years ago, when all of humanity had not yet been fossilized, Dr. Xeno and you, his old friend, worked together. You knew him from the beginning: from his thoughts, to the feelings he hid behind that familiar feline grin.

The green light, which appeared from nowhere, turned people into stone. Everyone was panicking trying to figure out how to avoid this, but Xeno just looked at the beam in surprise, through the fingers of your hands, which, as expected, were supposed to protect him... But ironically, all of humanity, without exception, was turned to stone..

Xeno, the first person to wake up from petrification, created his own group of people, which was under his leadership. He longed to rule this new world without hiding it.

But as soon as he learned that his former student had also woken up from petrification by creating his own scientific team, Xeno only began to crave more to own this world.

"Stanley, kill him for me. This world cannot have two brilliant scientists, especially those who have different views on life. It's so elegant!"

A familiar grin appeared on his face when he ordered you to eliminate Senku so that his plans would not be ruined because of this teenager.