A/N: I'm back with a brand new chapter! So Overlord season 3 is ongoing huh? I personally don't care much about that anime since it is far inferior version of Light Novel series and they cut off off so much stuff that it pisses me off. But at least I can hope for Shalltear licking off Arche XD

Edit: Some of you complained about the grammar mistakes in this chapter which I fixed as much.

Also, there is a poll of which Overlord one-shot crossover should I write next. It's on my profile so don't forget to vote.

Anyway, let's get to the character.

CHAPTER 4: LESSONS TO REMEMBER

While in the last few days, Ainz had learned a lot of this new world and its threats, but right now he wasn't feeling nervous about that. Though he hated the fact that his undead status restrict all his emotions but it also allowed him to mask his true feelings. Something that was clearly needed right now.

The eyes of all the forty one homunculus maids were on him.

Even as the ruler of Nazarick, it can be really difficult to explain his true motivates without anyone misunderstanding it. He definitely didn't want to have another case of invaders in his tomb again.

"So...uh...I called you here on a very different matter." told Ainz as all the maids tense up hearing this.

"Before I tell you exactly what it is about. Let me show you something."

With a gesture of his hand, Ainz summoned the mirror of Remote Viewing. Everyone present there had their eyes on the mirror.

Soon, the images started forming up. The images were of a huge metallic room where humans seemed to be working.

Ainz knew all of them were confused as it was really easy to see the confusion on their faces and rightfully so as none of them have any idea what a factory is.

"I suppose none of you what this is?" asked Ainz.

As predicted like all of them shook their hand in a 'no' except fot one.

"I believe it is the place where humans work for their masters but instead of doing it for the sake of their master, they are doing it to earn resources and keep themselves alive."

It was Fifth who replied.

"Oh? How do you know about this place?"

It was a surprise for even Ainz that she know about it considering none of Nazarick members have any idea of this new world and modern human society unless...

"It was Raynare who told me about this world and its few of its customs." told Fifth.

Thought as much. It's a good thing she is getting familiar with other members.

"I'm happy to see that you are gaining knowledge and getting along with Raynare." said Ainz.

"Someone like me doesn't deserve your praise, Ainz-sama! It was just during regular talk with Raynare I learned about such things." said Fifth sincerely.

"Praise is required where it is deserved. Anyways, as you can all see, the humans are working just like you and take between their work. But as you can say, they always take a day or two off from the work. Do you understand what I am getting at? asked Ainz looking at maids hoping they understand what he means.

"Yes, we do, Ainz-sama. You showed it to us to tell us how worthless and selfish human beings truly are." said one of the maid.

Eh?

"Indeed, humans are truly disgusting." said Albedo who nodded in agreement as she was standing next to him.

Eeeeeeeehhhh?!

"Uh...No. This is not what I meant. What I want to say is that all of you should take a day off from the work too." told Ainz.

Seriously why did my friends created all of them with the settings to hate humans?!

Suddenly the face of all of the maids turned from surprise to panic. In the next moment, all of them started crying.

" Is Ainz-sama unhappy with us?"

Huh?!

"Is he going to replace us?"

Huuuuuh?!

The entire hall was filled with sobs and cries of Homunculus Maids. A few of them even fainted in the fear of replacement.

"Silence!" commanded Ainz as he was surrounded by [Aura of Despair]

That single word was enough for maids to cease their drama. Partially because it was the command of Supreme Being himself and partially because of the effect of Despair Aura.

"The entire Nazarick is the creation of me and my friends. That includes all of you too. I would never think of replacing anyone of you. The reason I want you to all to take a day off in a week is to focus on other fields like training or learning. That way you will gain more racial stats while efficiently serving me." told Ainz.

A look of relief was evident on their faces as Ainz explained. The human side of Ainz mentally let out a sigh in exhaustion at this.

Seriously, it's way more difficult to adjust to modern society than in New World.

KOUH ACADEMY

"Seriously, making a harem is a difficult task. I thought I would have my own harem soon after becoming a devil but it's far more difficult than I realized." said Issei with a frustrated sigh.

It's been some time since he became a Devil and all he got were petty missions for humans.

Sure he got a lot of affection from Rias, Akeno and Asia but that's too far away from being a harem king.

"Alright, class, settle down." said the teachers as she entered the classroom, "Before we continue, I'd like to introduce you to new students here"

As she said, two individuals entered the room. One of them was a handsome boy with messy hair while the other was a beautiful shy girl. The entire class started whispering with each other about their other worldy beauty.

Even though, the girl were not as beautiful as Rias but she was no slouch either. It would be great if she became a part of his harem.

Now that he looked at the boy. He have to save he was not bad either. Even beautiful.

Wait! Am I turning gay?! Impossible! Inappropriate thoughts leave me be!

"Why not introduce yourself?" asked the teacher.

But it seemed that the boy was more curious than students as he simply ignored her.

"Oh so this is where humans gather knowledge. I'm disappointed really but that's what I get for expecting something more from inferior beings."

"I beg your pardon?" asked teacher even more confused.

"Nevermind that. You were saying?" asked the tomboy.

"I was saying that you should introduce yourself." said teacher slightly irritated by her behaviour.

"Ah yes. Hello, huma- I mean my classfamowers. I am Aura Bella Fiora and this is my brother Mare Bello Fiore"

Everyone had their jaws hit the floor as they hear that. Everyone was shocked by the sudden revelation expect for Issei who had a huge grin on his face.

Alright! I knew I can't be wrong. She was a girl all along and I'm still straight. But...wait...she said brother...that means...nooooo! This can't be!

The nearby students sweat dropped looking at Issei going pale as a ghost all of sudden.

"Onee-chan, it's classmates. Not classfamowers." corrected Mare.

"Well...uh...that was something new. Anyways, now that the introduction has been done with, you can take the seat wherever you can." told the teacher.

After that introduction, Aura and Mare took the empty seats behind Issei.

As they sat down near Issei, he noticed something we wasn't able to do before.

It was the power this pair was emitting. It was as if he was being crushed by a huge boulder. His first instinct was to run away from these new guys as far as they can.

As a new devil, he shouldn't be able to sense any power from anyone except for high level Devils. But the fact he was sensing such amount of energy made him realize that if he did something stupid here, it would be the end of him.

What should I do? Should I wait for Rias Senpai and others? Surely they would've sensed the danger by now? Ah man, this is really bad situation I'm in right now.

"Are you alright, Issei? You are sweating a lot." asked Matsuda

"Y-yeah. I'm a-alright. It's just too hot today." replied Issei with a fake smile.

"Indeed. Summers are really bothersome."

If only the summer was the only bothersome thing right now.

"Do you guys hear that there are multiple creatures with bat amd feathered wings in recent months?" asked one of the classmates.

"I don't know, man. It sounds like some people trying too hard to get attention." said other students.

"What do you think, newbies?"

"Hmmmm...i don't know. Could be fake or it could some devils." replied Aura giving Issei a smile.

If Issei wasn't creep out before, he surely was now. The smile wasn't a genuine smile but rather one that tells him that she know a lot about him.

"Ahem! I'm happy that everyone is excited to see new students here but let's focus on the studies here." said the teacher.

And with that, the class went as it usually does for Issei. He was glad that these new guys didn't caused any trouble so far but he still wasn't able to completely take his mind from them.

"So you got any leads on the people who saw us and stray devil few days ago?" asked Rias to her queen.

The two most beautiful girls of the Kuoh Academy were currently talking a walk in the hallway. Today was kind of weird as by now they would've been surrounded by admirers but right now they were left alone.

Weird but still a pleasant change for once.

"I'm afraid not. I have tried my best but still no luck. It's as if they never existed in the first place." replied Akeno.

While it was recommended to Devils to erase the memories of the people who have no relationship with them but there were sometimes where exceptions were made.

Still she didn't want to make a small mistake and have it come bite her in the future.

"I see. If possible, I want to alter their memories about the incident." told Rias.

"I know you are worried, Rias. But what can those normal humans do? Even if they tell others about us, do you really think they will believe them?" asked Akeno.

"Yeah you are right. Sorry for being paranoid. By the way, what do you think of Issei's progress so far?"

"He is quite weak right now but his potential seemingly limitless. Speak of the literal devil, there he is." said Akeno as she saw Issei running towards them.

There was a worried look on his face. It's rare for Issei to have such a worried expression as he is usually a carefree person.

"Rias-Senpai, did you saw or meet these new people who arrived here?" asked Issei.

Rias and Akeno both shook their heads in 'no' in response.

"That's impossible! How could you not sense their energies when someone like me could easily sense it?" asked Issei even more confused.

"Could be that they are only keeping their power towards you while hiding their real power from us." mused Rias.

But she still didn't know who he was talking about.

If they were new devils from the Underworld, she should have been informed by now. Both fallen angels and angels wouldn't try to enter an enemy's territory. Not to mention hiding their energies would only make them even more harder to find.

"Who are these new people you are talking?" asked Rias.

"They are two dark skinned twins about medium height. Though they have recently arrived but it seems they have already stolen your fans."

"I don't think fans matter much to me. Anyways, where did you past see them?" asked Rias.

"In my classroom. Though they are usually surrounded by admirers so it's not hard to find them."

Well at least they weren't trying to hide themselves.

"Yeah humans are really annoying."

The sudden appearance of the new girl startled the group.

"Uhm...onee-chan, y-you shouldn't scare them like that."

"I guess you are right. Sorry about that." said the girl in a casual manner.

"Ah these are the people I was talking about! Aura and Mare!" exclaimed Issei.

"Woah, I didn't expected you to remember our names. You Devils are different than humans" said Aura a little impressed.

Either Issei was mistaken or these guys were too good in hiding their real power since Rias wasn't able to sense anything from them. But the fact they know about Devils, tells her they are not normal.

"I take it both of you aren't humans. So what are you and how do you know we are Devils?" asked Rias

"Your energy is different from humans. And yes, we aren't humans either. We are dark elves." replied Aura.

"Elves? They are really rare in Japan. Let alone dark ones. But your ears are normal." pointed Rias.

As far as looks go, they weren't bad at all. Though they have little underdeveloped bodies yet there is surely a certain attraction. Guess that the beauty of elves.

"Magic, duh." said Aura in an obvious tone.

"That was a stupid question." said Akeno.

"Y-yeah, it was. Sorry about that. Anyways, what excatly are you doing here?"

"We were sent here by our mas- parents to learn about Devils, Angels and other races in Japan. So here we are to observe you." replied Aura.

"Y-yes, they told us it's a good way to uh gather more experience." added Mare nervously.

"I see. It is true that Japan is getting popular in other parts of the world. It is understandable that other races wants to learn about us too." thought Rias out loudly, "Though I would like to meet your parents too. I want to learn more about Elven culture too."

"I don't think it's possible. Our parents are still back home."

"Wait you are telling us you came from foreign land to Japan all by yourself?!" asked Issei surprised.

"Of course not. We came with our step uncle but he doesn't know about our elven background." explained Aura.

"I see. I would like to learn more about your race but we are running short on time due to school's schedule. How about you meet us in Occult Club House after the school? It is the three story building a few block from the school." told Rias.

"Sure. We would love to be there." said Aura.

"Ah yes. I-it would an honor." bowed Mare.

With that said, the twins returned to the classroom.

"Really an energetic and interesting pair." stated Akeno.

"You trust them, Buchou?" asked Issei.

"They seem friendly. Also the relationship between Devils and European races aren't as tense or hostile as other races here." told Rias.

"Well, I'm sure Kenko might make friends with them. Hopefully..." said Akeno.

"Onee-chan, was that a good idea?" asked Mare.

"Huh? What do you mean?"

"You promised them about something you yourself have no idea about." replied Mare.

That was true. She and Mare have very little idea about their own elven culture. Most of them were learned from books and learned from Elven Servants. It would have been better if they asked their elves servants.

"It doesn't matter. We don't necessarily need to tell them the truth. They themselves don't know much about Elven race themselves." told Aura.

"I see. Y-you are really smart, Onee-chan."

"That I am" chuckled Aura.

"Still I don't like so many humans surrounding us." said Mare looking at the fangirl and boys around them.

While they were one of the few Nazarick members that could considered 'safe' around humans. But that didn't mean they like human's company especially in such a huge number.

Letting out a sigh, Aura looker at Mare before grinning.

"Leave it to me." said Aura before looking towards the crowd.

"GET LOST"

In an instant, the atmosphere of entire classroom turn dark despite it was high noon outside. Everyone felt something on their spine. That was clearly hostility.

Not wanting to anger her, everyone immediately left the duo alone.

"There you go."

Mare simply chuckled nervously at her sister's method of crowd control.

The twins headed towards Occult Research Club after the school ended as Rias told them. Soon the building was within their sight. In New World, they haven't came across buildings like these.

While nothing compares to Nazarick but these buildings were still creatively build.

As the twins entered the building, they were greeted by Akeno. For what they heard, she was the most popular girl in school besides Rias.

She was certainly beautiful as far as humans goes but her beauty still falls short compared to Pleiades.

"Welcome to Occult Research Club." greeted Akeno with a smile.

"Are the rest of you here?" asked Aura.

"Ara Ara so impatient." chuckled Akeno, "Please follow me."

As they reached the main hall, they saw some new faces they didn't meet before. One of them was a blonde guy and a white haired girl who was busy eating cake. Rias and Issei were already there.

"Oh so you are the twin dark elves Rias talking about? Nice to meet you. I'm Kiba Yuuto and this is Koneko Toujou." said the blonde guy as he introduced himself and the white haired girl.

"So these are new hot topic of the school. Interesting" said Koneko before she resumed eating again.

"Don't mind her, she doesn't open to people easily. Though this is the first time Koneko took interest in someone." said Rias clearly happy.

"It's alright. I don't mind. So you guys are the only Devils in this town?" asked Aura.

"No. There is Asia but she is busy with after school activities today. Then there is Sitri's group. And since we Devils use teleportation circles so they are chances some devils teleport in and out of this town. But if they are here to stay, we are usually informed." told. Rias.

So that means if Nazarick wanted to take over the human world, then [Dimensional Lock] will be the best spell to ensure minimum interference.

"Hey, sorry if I acted a little rude before. I was taken back by your energy and sudden appearance so I thought you were a threat." said Issei bowing a little.

"It's all good. So I wanted to ask are you the guys the strongest of your race?" asked Aura.

"Haha sadly no. We are still a long way to be the strongest. Satan class Devils are the strongest of all Devils. There are 4 of them at the moment and they are strong enough to destroyed entire mountains with single blow. Then there is Ultimate, High, Mid class devils." informed Rias.

"I see. Interesting so Satan class devils are worth taking notes of." mused Aura, "I have still so many thing I want to learn about Devils."

"Well we have a lot of time so why not. I also want to learn things about your race too." said Rias politely.

The next few hours were spent on the twins learning more about Underworld and Devils. While Rias' group too got information about Elves albeit mostly lies and false stories from Aura.

The twins found out that they need a devil to enter the Underworld. While teleportation spells might work but it would like attract unwanted attention especially in a place with stronger enemies.

But what intrigued her most was that there were Dragons in Underworld and according to Rias they rival Satan class Devils. They might prove tough opponent but the idea of having them as pets was even more tempting.

"I have to say you are a funny and intriguing girl, Aura. Though Mare remained mostly quiet during the talk." said Rias.

"Mare is really shy. He usually get nervous around people." told Aura.

"That's really cute actually." said Akeno smiling at Mare.

Mare simply blushed and averted his eyes.

"Rias-senpai, it's almost time." Kiba reminded her of something.

"Already? Time sure flew by during our talks." said Rias before looking at the twins, "Tell you what. How about you guys join us on the hunt."

"Hunt? Of what?" asked Aura confused.

"Stray Devils."

"Sure why not. I want to see you guys in action." said Aura, "Right, Mare?"

"Y-yes. I never saw Devil before."

"Alright let's move out then." said Rias as they readied for the hunt.

The twins elves and Devil groups teleported in front of an empty warehouse near the outskirts of the city. Judging from the rusty appearance of building that nobody visited it in years.

Looking at that relaxed expressions of Devils, Aura and Mare deduced two things.

Firstly, they were sure of their victory against the stray devil. Second, the stray devil really lack any brain.

Choosing an abandoned building for hideout. Either that or Rias' information was false.

"Everyone follow me and be on your guard." said Rias as she entered the building while the rest followed.

The first sight they saw could only be described as slaughter. Dead and half eaten bodies of humans were dangling on the hooks. There were piles of bones every ten metres from each others.

Humans bones. All of them.

"What monsters. It is too dangerous to let go free." said Issei as anger was clear on his face.

"i swear to make them pay for their crimes." said Rias equally angry.

It seemed that Rias and her group values human lives a lot. A really worthless notion.

"Is this so?" came a deep voice from the shadows.

"Show yourself, vile creature." said Rias.

A large creature emerged from the shadows. It has a upper boys a young man while lower body was gigantic and beastly with four legs, each having sharp claws, and a snake as a tail.

It reminded Aura somewhat of a Chimera.

But it was alone. Suddenly four more similar creatures and a male devil of middle age emerged from the shadows.

Yup. Auta's assumptions were right. It was definitely the latter. Rias was properly informed.

"Shit. There are too many of them." said Kiba as he summoned his sword.

"Guys, it might be dangerous. If you want to leave now, you can do it right now." told Rais.

"Nah, it's alright. We will lend you a hand." told Aura confidently.

"Fine then you both take care of stray devil while we take care of these transformed devils"

With that battle began, Aura and Mare readied to face the stray devil while others were taking care of the rest.

"Dark Elves, huh? I will take those pointy ears as a trophy." laughed the devil.

But it seemed the twins were observing Rias' group fighting rather than taking the stray. Devil seriously.

"You dare ignore me?!"

"Geez, you boost and yell a lot for a weakling. Sit quietly and let us see them fight." said Aura without even looking at him.

"That's it!" yelled the devil as he prepared multiple energy balls.

But before he could blast off the twins, both of arms were separated from the shoulder.

The bloodied whip that dark elf was now holding was definitely the weapon that was used. he fact he didn't even see her summon it let alone use it was enough for him. To realize that difference between them.

Then the next hit him.

"ARRRRHHHHHHHHHH!"

It was pain.

The next moment he fell on the ground screaming in pain all while being ignored by the elves again.

"Hmm...what you think about them, Mare?" asked Aura.

"Uh they charge in the battle without much of a plan." replied Mare.

"Yeah. It seems Koneko and Issei are their heavy hitters. Kiba is their rogue. While Rias and Akeno being the support." said Aura while Mare kn agreement.

"They only killed so far. Seriously, they are weak too. Let's finish this up.." said Aura.

Using one of his spells, Mare cracked the ground upon behind two of the creatures as they fell straight into it before closing it and turning them into paste. While Aura used her whip to blow the remaining creature's head off.

"All done without much trouble." said Aura cheerfully.

The entire devil group had shocked expression on their faces as the creatures they were struggling with were eliminated in an instant by the elves.

"A-are all elves suppose to be strong?" asked Issei.

"I...have no idea." replied Rias

"So are we done here?" asked Aura little bored.

"Uhm...yes. You did left one alive though." said Rais pointing towards the armless devil.

"Oh don't worry about him." said Aura as she extended her hand towards his direction.

The stray devil was covered in bright light as he started screaming again as the next moment, there was nothing left him.

"There. Done."

"Scary..." commented Koneko.

" You both are far more powerful than I thought. Thanks for the help" said Rias.

"It was nothing. They are weakling." replied a hint of disappointment in her voice.

"Surely for you but not for us. I guess that's it for today. See you tomorrow at school." said Rias as she and her group head towards the city.

Aura let out an exhausted sigh once they were out of her sight.

"Man, acting sure is difficult." whined Aura.

"It wasn't really." said Mare.

"Easy for you to say. I had to do all the hard work."

"I-I'm sorry. But uhm I wanted to ask what did you do to that last Devil? You don't really know any destructive spell that I know of." asked Mare.

"Well I didn't kill him. I simply teleport him to Demiurge's farm." replied Aura.

Mare could only laugh nervously remembering about Demiurge's farm. That place was something where he did not want to visit again unless it's important.

"While we have made some extra progress in our mission. We shouldn't forget why are we here." told Aura while Mars nodded again.

With that said, the twins teleported back to Nazarick.

A/N: I hope you guys liked this chapter. It really takes a lot more time ot comes up with chaoters when you story is going way different than canon of both verses. I remember Evileye's spin off novel was suppose to release this year. If anyone knows the date, please let me know.

Anyways, favorite, follow and don't forget to leave a review.

EuSuntDracul1 out for now.