Westcott without a doubt is the biggest lunatic in the Date A Live universe.
Unlike Otto, his twisted sense of pleasure and psychopathic tendencies make him a villain who doesn't need redemption.
He could very well be considered the root of all evil in this world.
Everything began with the Spirits. And those Spirits were artificially created by Westcott himself, as part of the Magician's grand revenge against humanity.
Back then, the Three Sinners performed a ritual that gathered all the magical energy from Earth—land, sky, and sea.
Everything became light, and from that convergence of light… a god was born—Ultraman Tiga!
Ahem…
No, what was really born was the very first—and strongest—Spirit: Mio Takamiya, the origin of it all.
Westcott's initial goal was to harness the Realm of Origin—the territory surrounding the First Spirit.
A dimension barely separated from the real world by a thin membrane, this was the alternate space from which Spirits came.
Calling it a "space" may be misleading; its scale covers the entire Earth. To call it a world is no exaggeration.
And within that realm, Mio could manipulate every law, every rule, every natural principle at will. She was, quite literally, a god.
Westcott's grand scheme was to use that world to banish humanity, and create a realm where Magicians could reshape reality at will.
Magicians possess the power to absorb the reversed Spirit Crystals.
Though in the original storyline Westcott never managed to absorb Mio's reversed crystal, he did use Spirit technology to seize the Three Demon Kings—the counterparts of Mio's reversed form.
By most logical standards, the Demon Kings were equivalent in power to the Angels.
Though their abilities differed, their destructive power had a distinct edge.
Yet, at the climax of the original story, when Westcott pitted his Third Demon King against Mio's Third Angel in a showdown of pure energy, he lost.
Nagami didn't really understand why.
His best guess? Westcott might've just stood on the left side during the clash.
Even though Mio was essentially the embodiment of all magical energy on Earth—a glowing beacon of apocalyptic power—she was, at heart, a soft-spoken anime girl.
Unlike that pig-headed oaf Dyna.
Westcott's accomplishments weren't trivial.
He managed to steal Nia's incomplete reversed Spirit Crystal, granting him access to the Demon King: Book of Erosion—though its powers were limited.
But getting Nia to fall into despair is no easy feat—comparable to Otto successfully taking a vacation without getting cuckolded.
To push Nia into a true reversal—when her heart is still full of hope and love—that's like trying to romance a Kaslana-blooded battle maniac while pretending to be a helpless schoolgirl.
That's why the Apparition Device in Nia's mind was so dangerous.
It wasn't just designed to wipe her memories after emotional breakdowns—it would also restore all her traumatic memories the moment she truly opened up to someone.
The pain and despair would consume her, driving her into a full Reversed state.
But fortunately, that's no longer a concern.
Nagami had already destroyed the Apparition Device after it wiped Nia's memories.
Sure, brain surgery of that caliber would've been near impossible for the original researchers.
But for Nagami, who had both the evolved Alpha Stigma Eye and enhanced cognition? It was a piece of cake.
Besides, Spirits aren't exactly fragile humans.
The risk of Nia reversing again had already been completely eliminated.
Without the Book of Erosion, Westcott no longer had the chance to become this world's final boss.
"So, this is why you killed him before he could grow any stronger, my love?"
Inside Westcott's private office, Nagami sat on a throne-like chair overlooking the city skyline.
In his lap was a beautiful Spirit girl with a slender waist and voluptuous curves, her soft body tucked snugly into his arms.
Kurumi placed her delicate hands on Nagami's chest, glancing toward Ellen—who was nearly driven mad with jealousy—and let a satisfied smile curl on her lips.
She nestled closer into Nagami's embrace.
Her full, soft chest pressed tightly against him.
A warm, sweet scent lingered in the air between them.
A glance downward revealed the pale nape of her neck and the graceful lines of her collarbone beneath her black-and-red Spirit outfit—utterly enchanting.
And yet—
Nagami, ever the mood-killer, gently pushed her away. "She's completely broken now. Even if she went nuts, there'd be no thrill in it."
"..."
Kurumi tilted her head, placing a graceful white hand to her cheek as if in thought, then nimbly hopped off Nagami's lap.
"You're right. Right now, she probably has nothing left in her heart except her 'love' for you. Maybe even this whole world means less to her than a single smile from you."
She glanced over at Ellen, who was busy cleaning up Westcott's corpse, and couldn't help but feel an odd sense of irony.
After Nagami's explanation, she understood: this man, in the original timeline, would have become a world-class final boss.
And yet here he was, dead.
Killed so easily.
By the very person who was once his most loyal subordinate—his old friend.
Yes, only three people had come to the DEM Japan branch to deal with Westcott:
Kurumi, Nagami, and Ellen, who had been hit with a 'Love' Geass.
To prevent Nia from recovering any horrifying memories upon seeing Westcott, Nagami had sent her off with Mana Takamiya to find Shido Itsuka—or rather, Shiori Itsuka, now.
As for Inori Yuzuriha—her body had been worn out from how much power Mana Ouma had poured into her.
Nagami had already coaxed her into taking a rest.
And so, this future final boss was taken down… by a three-person party.
And of the three?
Nagami and Kurumi didn't even lift a finger.
After Nagami split Earth's "Misaka Electromagnetic Cannon" right down the middle with that god-tier parting blow, Westcott lost all his sources of intelligence.
Though he maintained communication with Artemisia via magic, even he could feel the sudden spike in her mental energy at the last moment—a clear sign of overwhelming shock and terror.
That, combined with a growing sense of unease, eventually led Westcott to make a decision: run.
After all, someone capable of becoming a final boss behind the scenes wouldn't survive this long by being all brawn and no brains.
If he'd really been a joy-hungry maniac without the IQ to back it up, the weeds on his grave would already be three feet tall.
And yet, even someone as cautious as Westcott let his guard down when faced with his bloodied, battered old friend—Ellen—her clothes tattered, her body covered in wounds.
He didn't expect betrayal.
He was a magician himself, after all.
While his direct combat strength couldn't match Ellen's, he had command of ancient and mysterious Spirit spells.
He was curious, of course—how had Ellen escaped from Nagami? Had she paid some terrible price?
But this was Ellen—his most loyal subordinate for decades.
He knew her inside and out—her habits, her quirks, even her slightest movements.
It should have been easy to tell whether she was real or fake.
And that's exactly how Westcott ended up eating a full-blown backstab.
When someone's been hit with a Geass of Love, there are no outward signs—only their will and thoughts are altered.
The glowing red eyes you see in anime like Code Geass? That's just for the audience's benefit—there's no such visual cue in reality.
Consumed by an obsessive, bone-deep love for Nagami, Ellen delivered the performance of a lifetime.
Watching from the shadows alongside Kurumi, Nagami couldn't help but shout internally:
"Simping… is overpowered as hell!"
Though he was the one being simped for, it still felt… unsettling.
The strangeness of the whole situation made Nagami quietly vow: if this ever happens again, he'll make sure not to leave anyone hit by the "Loved" Geass alive.
Turning someone into the ultimate simp, a walking monument of selfless devotion—that's a torture technique worse than anything.
As for why he didn't hit Westcott with the same Geass?
Simple.
He's a guy.
Damn it. Men…
Nagami let out a sigh and started punching the air in a short, regretful kata as a form of self-reflection.
Yes, this so-called "hero" had shamelessly ambushed the final boss before he could reach his final form—ending it before the big fight even began.
"What are you going to do about the DEM Corporation?"
Kurumi asked suddenly, her body slowly sinking into the shadow space Nagami had opened.
"Eh, stir-fried it is~"
Nagami shrugged casually, his answer earning a long, exasperated look from Kurumi.
"As a shameless foreign invader, I only do the killing—not the cleanup. I'll just leave the rest to this world's governments. This kind of mess? It's a giant cake of political opportunity."
Then he turned to Kurumi, raising an eyebrow. "By the way, Kurumi… after all this time, you still haven't absorbed enough to go back to 20 years ago?"
As any normal young man would, Nagami—who had enjoyed the delightful experience of being sandwiched between two soft buns before this mission—found it hard to endure these long, lonely nights.
Sure, on the surface, his relationship with Kurumi looked affectionate and flirtatious.
They'd even talk about borderline raunchy stuff with no filter.
But their actual romantic tension was stuck in a very delicate balance.
Of course, if he were to suddenly pounce on her in the night, Kurumi probably wouldn't resist.
Truth be told, she kind of wanted his body, too.
As for Nia—her affection for Nagami was sky-high.
That teasing little nun wouldn't say no either, but they hadn't been through enough together yet.
Nagami couldn't bring himself to cross that line so soon.
And Inori? Let's not even mention her.
Which was why, at this moment, Nagami really, really wanted to go back to the Honkai universe.
"..."
Kurumi averted her gaze ever so slightly, then softly wrapped her smooth, delicate arms around his.
"Enough, enough. If it's just 20 years… I've already got enough stored. We can go anytime now, dear husband~"
In truth?
Miss Kurumi had already absorbed a full 100 years' worth of energy.