The human brain housed a mass of electrical signals, racing between its neurons.
Decades earlier, people could only use devices to receive those electrical signals and turn them into remote commands for operating machinery.
Then, a little over a decade earlier, the first generation of Virtual Reality devices had appeared, capable of drawing out biological brainwaves.
The technology was called Neural Interactive Synesthesia.
At first, feeding biological brainwaves into Super Robots had caused incompatibility issues that burned out their systems.
But times had advanced, and technology had evolved.
In the years that followed, humanity had successfully mastered brainwave extraction and guidance.
For a time, this had led to consciousness entities sneaking across networks and illegally possessing bodies...
On the living room sofa.
Stendhal looked at Natasha before him, guilt written all over his face. "I'm sorry, darling. I thought that once I came back, I'd be able to stay with you forever..."
Natasha smiled faintly, brushed the blond hair on her shoulder behind her back, and said gently, "It's all right. This time, we'll go forward together."
Stendhal's lips puckered despite himself. Tears shimmered in his reddened eyes, and he began to whimper.
She scooped up Fei'er, who was sitting on the floor, and pulled the sniveling Stendhal close.
"Fei'er, Fei'er! Mommy and Daddy are taking you to fight monsters! How does that sound?"
In a simple white room.
Sitting on the edge of a gray bed, Qi Siyu held a white Virtual Reality helmet.
He gave a self-mocking smile. "Still couldn't escape ending up fighting aliens..."
Putting the helmet on, he murmured.
"Activate Neural Interactive Synesthesia..."
The burly Li Yunran held a soft-cap-style Virtual Reality device.
Dressed in white sportswear, he sat on a white bed and gazed out at the world beyond the window.
"Heh.