The air in Tokyo's 20th Ward carried a faint metallic tang, a reminder of the blood that had spilled in its shadows. Months had passed since Hide's death, and Ken Kaneki was no longer the soft-spoken college student who lingered over books and coffee. Grief had hollowed him out, leaving a void he filled with purpose: a purpose that now bore the weight of an alias: "K."

He stood in a sterile lab, the hum of machinery a constant companion. His hair, once a gentle brown, was streaked with premature white, a mark of the sleepless nights and relentless drive that had consumed him. Before him, a vial glowed faintly, its contents shimmering like liquid ruby. This was Cogito, a substance born from his obsession, distilled from the very essence of life and death: Rc cells.

Rc cells were the lifeblood of ghouls, flowing through their veins like liquid muscle, capable of hardening into deadly kagune or sustaining their predatory existence. Humans carried traces of them too, a whisper of potential locked within their biology.

Kaneki had stumbled upon this truth during his time as a researcher at the CCG, a position he'd taken not out of loyalty to the doves, but as a means to an end. Hide's death had ignited a fire in him, and the CCG's resources were the kindling.

Extracting Rc cells had been a gruesome art. Ghouls imprisoned in Cochlea, the CCG's fortress of despair, became his unwilling donors. Under the guise of advancing quinque technology, Kaneki dissected their kakuhou, the organ that stores and shaped Rc cells, by refining a process to isolate and amplify the cells' potential.

What emerged was Cogito, a volatile, radiant substance that pulsed with possibility. It was more than a tool; it was a key to rewriting the world.

Kaneki's first breakthrough came with what he called "Extermination of Geometrical Organ" or E.G.O. The CCG had long relied on quinques, weapons forged from ghoul kakuhou, to combat their prey.

But quinques were a luxury because they were costly, time-intensive, and often reserved for elite investigators who could claim a ghoul's corpse or wait for Cochlea's backlog to churn out a blade.

Firearms, the old fallback, were clumsy against kagune-wielding ghouls. The CCG craved efficiency, and Kaneki delivered.

E.G.O. weapons were revolutionary. By injecting Cogito into a subject, Kaneki could manifest personalized equipment from their mind: blades, armor, tools of destruction imbued with immense power.

Unlike quinques, E.G.O. didn't require a ghoul's death or months of crafting. Dozens of low-ranking investigators, armed with an E.G.O. born from their own psyche, could face down an S-rated ghoul and emerge victorious.

The CCG hailed it as a triumph, a new dawn in their war. Kaneki, now "K" to his colleagues, became their eminence in shadow.

But salvation came at a cost. Testing Cogito was a descent into horror, conducted in the shadowed cells of Cochlea's death row. Kaneki's subjects were the condemned: Murderers, madmen, those society had already discarded.

He told himself their lives were a small price for a gentler world, a mantra to silence the echoes of Hide's laughter in his mind.

The first trials were promising. Low doses of Cogito produced E.G.O. with minimal risk: A claymore here, a rifle there. But Kaneki pushed further, driven by the vision of a power that could end all suffering.

Higher doses revealed the truth: Cogito was a double-edged sword. The death toll climbed, bodies piling up as test subjects convulsed, their minds fracturing under the strain.

Kaneki watched, clinical and detached, noting every failure in a ledger that grew heavier with each entry.

Then came the abnormality.

The subject was a schizophrenic serial killer, a gaunt man with hollow eyes and a history of violence.

Known only as "Prisoner 047," he'd confessed to murdering eight people, claiming voices drove him to it. His file noted suicidal tendencies, as evident by the self-inflicted scars criss-crossed his arms. Kaneki chose him for a high-dose trial, curious to see what Cogito might draw from a mind so broken.

At first, nothing happened.

The injection went smoothly, the man slumping against the cell wall, muttering to himself. Kaneki observed through a one-way mirror, pen poised over his notes.

Then, chaos erupted. With a guttural scream, Prisoner 047 slammed his head against the pavement, again and again, blood pooling beneath him in a grotesque halo. Guards rushed in, shouting, but the man lunged, his movements feral and unhinged.

They opened fire, firing dozens of bullets tearing into the man, but he didn't fall.

Even when restrained and riddled with hundreds of holes, he still twitched, alive against all reason.

Kaneki's breath caught, fascination overtaking dread. "Secure him," he ordered, voice steady despite the pounding in his chest. The guards complied, dragging the thrashing figure into reinforced restraints.

Up close, the transformation was undeniable. His body had warped, with jagged bone protruding from his skull like a crown, and his hands were clawed, dripping with his own blood. This was no E.G.O. wielder. This was something else.

"Forsaken Murderer," Kaneki dubbed it, the name slipping from his lips as he stared at the creature with intrigue and horror.

Struck with the revelation that it was a manifestation of the man's mind, his guilt, his rage, and his longing for death.

Cogito hadn't just failed, rather, it had birthed a monster, an Abnormality reflecting the darkest corners of human desire and fear.

In the days that followed, Kaneki buried himself in his work, the incident fueling his resolve. The CCG saw only the success of E.G.O., blind to the shadows he was weaving.

Even as monstrous Abnormalities haunted Kaneki's dreams, their twisted forms a stark reminder of his guilt, he pressed on. He buried the cost of his actions beneath an unwavering belief that the means would justify the ends.

Using the CCG funding and his ingenuity, he laid the foundation for "Lobotomy Corporation", an energy startup cloaked in the promise of "Enkephalin", an eco-friendly miracle byproduct derived from his experiments.

The public and the media would adore it, while the CCG would be none the wiser to his true intentions. Because beneath the surface facade, Kaneki's true ambition simmered with a dream called the "Seed of Light.", a vision to reshape a broken world, born from the ashes of Hide's smile.