A/N: Alright, alright, I promise, this is the last fic I will be dashing out for the heck of it. After that, it's either, GoT, or King Crimson Izuku getting updated. Just wait, okay? Trust this bad writer of a story you decide to follow.

Yes, it's another crossover, however, I will need a big help from the potential reader of this story compared to my other fanfics. The reason for this is the power level. I didn't read the light novel (I plan to do so), so I'm at the part Diablo is named. So one of the show is Reincarnated As A Slime, and no way I'm writing the full name.

It's partner is Devil May Cry. So you see, this is where I need help particularly from the readers who read the light novel. It's not only power level, but there's also another thing I want to know, for example: Can a half-human get stronger if they are named? I mean, Milim is a half-dragon and half-human.

So anyway, here we go, just a test story before writing the full one or maybe continue it from here based on the review.

Disclaimer: Devil May Cry belongs to Capcom, and Slime is owned by its respective owner.

-Chapter Start-

Have you heard of it? I'm sure you have… What's that, you haven't heard of it? Then let me tell you the ancient tale of Sparda, the Demon who betrayed his own kin.

Long ago, a huge battle took place between the Living Real and the Demon Realm. The vast numbers of the Demons is overpowering, overwhelming. Add to that, they're ruthless, relentless, and heartless.

The one leading them, is a being considered as the king of all Demon, Mundus. And under his command, is the Demon General, Sparda. The latter is no different from the other Demons except for one major difference: His strength.

Sparda is considered one of the, if not the strongest Demon if it wasn't for Mundus. During the war, Sparda made a visit to the Living Realm, and met with the humans. Upon interacting with them (through disguise and/or illusion magic), he found that humanity could become stronger, and have potential to be even greater.

With this discovery, Sparda made a fateful decision. Without regrets, he turned his back on his kin, kept all the Demons back to the Demonic World, and sealed the gate. With it sealed, the Living Realm is safe, but not without a cost. Since the Demonic World is sealed, so is Sparda's massive power.

Later on, he then fell in love with a human, mate with her, who then bear his children. Two sons, a twin, born with the potential of human and Demon.

Their name is unknown, for a tragedy befell them. You may doubt this story, but it's the truth. Otherwise, how can you prove such things exist?

The camera then shifted towards a different direction, showing a teen with silver hair, lunged into battle against a horde of Demons. His blue spiritual-looking wings, glow bright, as if to resemble the hope of humanity.

-Line Break-

In a different location…

One can say, in here, the background is MASSIVELY different. Spiney looking plants, purple skies, weird looking creatures, and another creature getting cut down in the middle of a duel.

Wait what?

True with what the narrator said, a duel is taking place in the midst of all this chaos. For a lack of better word, the duel is literally red versus blue. However, the duellers are similar. Their eyes, the hair colour, the facial, jawline, etc.

In this plane of dimension, known as the Demonic Realm, every creatures that inhabited here knew who they are just by their smell.

The smell of Sparda, his kin!

Must kill!

Those are the only words that fill their thoughts, as a massive surge of hatred travels through their veins, interrupting their duel in the name of their conquest.

Which, does not please the twins whatsoever.

"OUT OF THE WAY!"

"Hmph.."

CLANG!

Sparks flew as their swords met, the man coated in red, uses a large silver broadsword, demonic as his heritage. The man pushed his hand against his blade for added strength against the sleek smaller blade of his twin.

The man in red smirks, replied by his opponent. "Come on, Vergil, is that all you got?"

Although his smirk still in place, the Dark Slayer, Vergil, narrowed his eyes in total concentration. "This is our hundreds or so battles, why don't you figure it out?" With his words said, Vergil pulled his blade away, making his twin lost balance. Taking his opportunity, he slashed his sword in an attempt to end the fight, but the man in red deflected with a well timed parry.

The sound of a sharp rotating sound grab their attention, as a Chaos, getting closer to them. The man in red clicked his tongue before dodging out of the way before the Demonic creature cut him down. Vergil done the same, then dashed back in and slashed upwards against the direction of the spinning blade, stopping the movement. Dante grinned and cut the Demon's head off in one clean strike. "Score one for beautiful Dante!"

"Tch, that doesn't count, you miserable fool!" Dante groaned at the words of his twin (older) brother. A sudden buzz noise heard by his side, and found a Fury, arm blade poised to cut his head off.

Dante merely smirk, then intentionally dodge the strike at the last second, cutting off some of his goatee. "Wooo, a free shave! Here's your payment!" Dante sent a downhill axe kick, crushing its skull, as it dropped to the ground, forming a crater, proof of Dante's powerful strike. The Legendary Demon Hunter do not stop there however, as he materialised a Bazooka, before shooting the death blow in a shower blood of gore.

On the other side, Vergil lost his smirk and kept an emotionless face, casually parrying the strike of the Fury. Getting tired of the folly, he closed his eyes and reopened, with his body several yards away from the back of his enemy. Vergil sheathed his sword, and at the same time, many cuts formed on the Demon, killing it.

"I know I've said this before, but I'm starting to think this never ends."

Vergil scoffed before sitting down, next to his brother. "And I've told you, we got plenty of time."

"Do you even know how stubborn we are?" Dante raised an eyebrow in mock confusion, getting a clicked tongue from his brother. He started to stand up, and entered a stance, demonic energy entering his body in an alarming rate. Vergil replied with the same, gathering demonic energy, quite easily thanks to where they are.

While Dante's stance looks like he's about to jump and bash, Vergil is ready to dash and slice in a matter of moment. Moments later, their body transformed, revealing the shocking result.

Both children of Sparda have entered their Sin Devil Trigger, and even in this form, they look similar if not for minor difference. Both of them dashed at the same time, their intent clear within their demonic eyes.

However, this did not happen.

They stopped, as their blade are inches from cutting their head. The reason for this will be their surroundings. Everything look grey, and seem to be immobilised. The twin brothers soon dissolve their Sin Devil Trigger, as it consume huge amount of energy and stamina.

Vergil narrowed his eyes. "I am not aware your Quicksilver can stop an entire dimension.."

"Pffft," Dante scoffed, "If I am able to do this, I would have done it from the beginning."

"Report. Time has frozen with the exception of the individual Vergil, and Dante."

The sudden interrupt from the voice alerted the two children of Sparda, as they looked around, alerted and guard kept up.

"Who are you? Show yourself." The ever calm Vergil claimed, his brother not saying a word for once, with his broadsword on his shoulder.

"Report. I have come here with an offer that might be an interest for the both of you." The mysterious voice claimed once again.

"Yeah, sorry babe, if you are a babe, judging from your voice. But I would be a tiiiinyyyyyy bit more trusting if you show yourself." Dante spoke this time instead of his brother.

However, the voice continued on without care, "Report. An individual is reincarnated as a Slime in another plane of dimension, separated from Demonic Realm, and your Living Realm."

Vergil sighed, controlling his temper a bit at the audacity of this voice. "How is that of any concern to us?"

"What my brother said here. Although, I'm curious of this.. different world of yours." Dante gave in his two cents.

"Report. The two of you are to guard the reincarnated Slime."

"Okay, now its just ignoring us…" Dante sweatdropped, glancing towards his brother, whose hand clenched the hilt of blade tightly. "Well, are there any hot babes there?"

Leave it to Dante to make girls his main priority.

"Report. You will have to see for yourself. Do you accept, to go to another world and guard the reincarnated Slime?"

Vergil opened his eyes and lashed out, his blade unsheathed as he delivered a devastating strike, which split the very space. "Um… I don't think that worked…"

Vergil sighed at the obvious from Dante, "Even a newborn child would be aware of that, brother." The older twin sheathed his blade, then spoke. "Give us a moment to discuss this rather… Bizarre occurrence."

"Report. Request is confirmed. Please, take your time."

Dante smirked at his brother, which earned him an annoyed sigh. "You've already thinking of going, aren't you?"

"Yep!" Dante confirmed it, popping the 'p' just to annoy his brother.

"What about Nero?"

"Awww, you cared about him~!" Dante teased, angering his short tempered brother. "I think he'll be fine. He's your son, isn't he? It's not just your temper he inherited, y'know."

"I will ignore that last information." Shaking his head, with a tiny smirk formed on his face, he turned his head towards where they heard the voice. "We accept."

"Report. The request for two individual to guard the reincarnated Slime has been confirmed. Initiating transfer of the individual Vergil, and Dante."

The two brothers looked at each other, their mind thinking the very same thing. "Do you hear that weir-" Dante's words were cut off before he could finish it, as the two kin of Sparda vanished from existence.

Now begin, their adventure in another world.

-Chapter End-

A/N: So, it's a very short chapter indeed. I do not want to include the murder of Rimuru's human life, and merely want to focus on the introduction of the twins.

Yes, the first description is Nero.

I do not dare to progress further because I may put false information about the power level. I do not want to put 'Veldora sensed a pressure that's comparable to a True Demon Lord/Primordial Demon/True Dragon' because again, I'm not sure where they rank in terms of power.

Anyhow, while I gather information from the review (if it has reviews/informations about the power level and naming a half-human), I will now focus my attention on King Crimson Izuku or Ghost of Tsushima's Danmachi.

With that, I bid you farewell.

Silver III Jhin, out!