[Crossover] How Could a Gem Like Me Fall in Love with an Ancient Creature?

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I'm Bolu. My full name is too long to bother saying.

As a new member who threatens to take my place in Dia-senpai's heart, I don't exactly get along with Bort. She gets handsy with me every day.

I only like the encyclopedia. Please stay away from me, thanks.

Thanks.

Thanks!

...Why are you still here?!

After Bort kept picking fights with me in all sorts of ways, I finally couldn't take it anymore. I went on a one-day undersea outing with my fragile junior. But for someone as steady as me, I sure managed to crash and burn.

I ended up in ancient times! (Probably.)

The legendary humans! Rare subjects for observation!

And maybe I'm just incredibly lucky, because there are all kinds of things to explore: Yokohama after the Dragon Head War, the Taisho era where humans and demons coexist, recipes involving twenty fingers, golden ring-shaped eyes and their dogs... and so on.

Also, how could a stone person possibly fall in love with a human? Please, just throw out all those romance novels in your heads...! Be realistic!

/

When I woke up underwater again, the world had completely changed.

Towering skyscrapers, endless stretches of buildings, busy traffic routes, and hidden currents stirring beneath the darkness.

This was the distant past, before the world was destroyed, when humans still held dominion: ancient times.

A young human dressed in black invited me:

“You don't have anywhere to go right now, do you? It doesn't matter where you go anyway, so why not come with me?”

“Sure.”

I said that, anyway.

But getting lost isn't my fault!

P.S. The story is episodic, with no big crossover or blended worldviews.

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Next door:

Uchiha Don't Want to Spend Money

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To be honest, as an ordinary member of the Uchiha, one of Konoha's great clans, I was walking out to buy dessert in the middle of the night when some damn idiot slit my throat. My head went flying right off, and blood sprayed everywhere.

I couldn't help cursing.

Damn it!! My ridiculously expensive dessert fell on the ground!! I didn't even get a bite!!! Pay me back!!!

Once I'd calmed down, I noticed that my head, which had rolled over to me, had an unusual pair of eyes with twisted patterns in their sockets.

When I saw them clearly, I froze.

Holy crap.

...Those look like Mangekyo Sharingan?!

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I died on the night of the clan massacre.

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The ability is similar to a Naruto game simulator: jump between timelines, create new characters, and play through their lives and strategies.

Characters with crushes on me get mixed together in a chaotic stew, both men and women.

◆The emotional theme isn't love, but romance was the only option.

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Next door ↓

Jujutsu Special Division Against Devils

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To cure his condition, which passively and indiscriminately kills everyone, Yuan signed a contract with a higher-dimensional being that called itself the System.

The System told him that in this world, where the strongest human had gone missing, he had to play the cards he drew, smash Curses into the ground, and maintain world peace. Humanity needed his protection!

But when he looked at the cards in his hand...

Control Devil Santa Claus, Gun Fiend, War Devil, Bomb, Chainsaw, Death Angel.

“Whoa, those are villains who turn traitor later and destroy the world...!!”

The System: “...No, I already told you, you're just a savior. Listen to me!”

“Fine. First... I'll turn the Zenin who came after me into my dogs!”

He really wasn't listening at all.

With the strongest human, Gojo Satoru, missing and Curses growing more rampant by the day, a Cabinet Office department called the Public Safety Special Division Against Devils appeared out of nowhere. As a lawful, state-appointed instrument of force, it turned the tide and maintained peace and stability in society.

...And gave the Jujutsu higher-ups, already on the brink, a good beating.

Makima, head of the Public Safety Special Division Against Devils, and her loyal and dependable subordinates (dogs) wield terrifying, top-tier power. Their methods are bizarre and unpredictable, enough to make anyone tremble. But it seems none of them are quite right in the head...

But that isn't the most important thing.

The most terrifying thing, something no one could ever have imagined, is this:

Makima, the highest-ranking official, who protects the people, saves society, and is admired, respected, and loved; strong, reliable, and reassuring.

Makima, who unleashed a rain of blood, bewitched humanity, burned yesterday to the ground, brought about the birth of the greatest and most evil Curse, and committed an unforgivable crime.

The messenger of hell.

The Control Devil.

The most terrifying enemy in the entire world.

And yet she says,

“I will make everyone happy.”

Her voice spread through the air, and everyone fell silent.

Then, against their will, tears began to fall.

Theme: Should we seek the truth?