Disclaimer: I don't own Overlord or My Hero Academia or anything I might say in the story.

The Immortal Hero

Prologue:

Life is hard when your parents don't pay attention due to being busy all the time from work all the more when your family is quite rich. Even though when you live in a mansion and have maids and butlers around, being the only child can be lonely.

Even more difficult is where the world you live in is where almost all the people there have power called quirks and have concepts of Heroes and Villains. The more powerful your quirk the more popular you are. People with less powerful or even no quirks sometimes get ignored or even bullied.

This is the case of Suzuki Satoru, a 14 year old, black haired kid with blue eyes. He has a rare but quite not so interesting quirk called "Virtual Game Control". He can mentally enter any computer game that he likes and play them like if he were there. The downside is that he can only enter himself and not others.

Basically at school he was almost quirkless due to having his almost useless in any situation. Satoru was ignored by all his classmates except one, Momo Yaoyorozu. They first met at a ball attended with their parents due to having both rich status. They talk to each other and become friends.

He also has another friend that he met sometime ago, Midoriya Izuku. He met him a while ago when he was snuck out of his mansion to buy more games and maybe meet a new friend. They became friends quickly because of having almost the similar situation at school. Izuku kept rambling on how cool Satoru's quirk is and even thought of ideas to improve it.

To further develop his quirk, he thought that if he keeps playing games with his quirk he could somehow improve it and be useful. It was one of Izuku's suggestions but even without saying it he would have done it too. And for a long time he would seem like a shut-in-neet.

When it was Satoru's birthday and his parents told him that they would come home and celebrate it together. He was overjoyed when he heard that and waited for them at the door. He kept on waiting and waiting at the door but no one came. The next day he saw on the news that the plane where his parents were in was hijacked and crashed. He wept that day.

Both Izuku and Momo texted him out of concern if he was alright. He replied he was fine, he was not. The maids and butlers resigned the next day after watching the news. The reason being that the one that Hijacked the plane was a well-known terrorist group set one targeting rich people. They knew that there was a chance that the mansion would be targeted.

Satoru was left all alone living at the mansion that day. It was also time for the preparation for entrance exams for highschools. Many students we're aiming at good schools that have good heroes but Satoru didn't care. Before leaving the school Satoru was stopped by Yaoyorozu.

"Wait a minute, are you sure you're alright? You're more down than usual?" The pony-tailed girl asked in concern.

"I told you I'm fine, I uh… was just thinking about what highschool to enter," Satoru lied to her.

"Oh… I see..." She replied. Satoru then left.

As he was walking he thought, 'Highschool, Dream, Hero huh? Midoriya said something about entering UA and Yaoyorozu already got recommended there. Me? It doesn't matter anyway, my days are already numbered. Guess I'll play to my heart's content.'

He realized that it was just a matter of time before his home gets attacked by terrorists and takes his family heritage. He was sitting laying down on his bed while his computer was running. He was having cup ramen again for dinner that he put at his table.

"Tonight? Maybe tomorrow…" He muttered to himself thinking when will terrorists attack. It was currently a thunderstorm outside so he thought it would be the best time to attack if they wanted to.

He concentrated before using his powers to play the game that was running on his computer, "YGGDRASIL". It was an MMORPG that he still played for a long time but was getting shut down at midnight. He played many games before but this was the only one that he got attached to. Using his quirk he felt like he was really talking to the players face to face. He had made some online friends

Satoru and his online friends made a guild together called 'Ainz Ooal Gown' and was like a home to him. It felt more like reality than the real one itself. But due to some having work and the game closing, many have already left. Before leaving, the guild members left their items and belongings to Satoru or more specifically "Momonga" which was his name on the game.

They also gave him some ideas and designs of NPC that they wanted to create if that was implemented in the game but never did. In the world of Heroes and Villains, MMORPG didn't improve that well and died in the long run. Many players had wished that they could enter the game like they were inside it, like Satoru.

Being the guild leader, he thought that it was his final duty to see the guild's final moments. Satoru had some final conversation with a member before he left. He was thinking on how he could have stayed with his online friends longer if the game was developed further.

Satoru was sitting alone at the guild table waiting for the game to finally shut down. His character, Momonga, was an Overlord, an undead skeleton creature who is devoid of skin and flesh. He tends to mainly wear an elaborate, jet-black academic gown adorned with golden and violet edges.

Momonga sat at the "Throne of Kings" at the 10th level of the guild. It was the lowest level of the guild-based dungeon and was rewarded to them for beating it in their first try. He said some final words before the clock hit 12 midnight.

"It was fun."

At the same time lightning hit the top of his house, disrupting all electrical devices at the mansion. But Satoru didn't notice this, No, He was at a different place.

Momonga was still in the game, not knowing how. He was analyzing the situation. The Overlord thought that maybe the server shutdown was just moved but wasn't the case, He can't get out. Momonga was stuck in the game in his character. What's worse is that he was all alone.

He tried to wait it out but minutes turned to hours and into a full day. With nothing to do, he explored the whole place and saw it was still the same game it was. Then the day turned to a week making him anxious. But for some reason he didn't feel hungry or tired. Maybe it was because of his character.

Curious on the current events, he tried to mess with the game settings. He learned that for having no one around managing the game anymore, he was given rights to edit and create things to a certain degree.

For starters, he created an NPC that he always wanted. Pandora's Actor was his first creation base from his own designs. Took him some time to create him.

Pandora's Actor hat bore the crest of Ainz Ooal Gown, while the uniform he wore was very similar to the uniforms used by Neo-Nazi elite guards. While he was dressed like that, he is just an egghead with no distinct facial feature except the three holes protruding on his face.

His second creation was Shalltear Bloodfallen that was based on his guild mate "Peroroncino" design that he gave him. Shalltear is a vampire of short stature and has the appearance of a buxom fourteen-year-old girl. Described as true beauty, she has pale shiny skin, seductive crimson-red eyes, and fine facial features. Shalltear's silver hair is tied in a ponytail through a large ribbon on top of it all, allowing others full view of her face.

He continued to create the NPC to fill his void of loneliness.

He was already at max level of 100 before and the guild already has the staff of Ainz Ooal Gown made that's why it was not difficult for him to make them. On other times he would go out and fight monsters to kill the time and sometimes tried to look for other players that got stuck just like him but never did find anyone.

At first he thought he would go insane for not talking or communicating with anyone but never did. Must be because he is an undead.

Almost a year has passed and he created all the NPC and made a few alterations to the Tomb. He made the surface part of it look like his mansion to at least make him feel like his old home.

Momonga sat on the "Throne of Kings" again and tried to remember his past life before all of this.

"Exactly one year huh?" He said to himself.

By his side was Albedo, an impeccable beauty, Albedo is a woman with lustrous jet-black hair and the face of a goddess. She has golden irises and vertically slit pupils; on her left and right temples are two thick horns protruding crookedly, and on her waist are a pair of black angel wings.

Momonga made a few alterations to her settings, from "a bitch" to "Is deeply in love with Momonga". He felt sorry for her settings, that's why he changed it but also felt bad for changing his friend's, Tabula Smaragdina, original creation.

Just near them is Sebas Tian and the Battle Maids, kneeling and waiting for him to give his orders.

Momonga was thinking how his only two friends are doing back in the real world? It was also midnight at the game world now.

"I wonder how my life would be if I was still back home?" He muttered to himself.

Suddenly he felt cold sitting on the throne, not just that but he felt he got shorter all of the sudden. He tried to open his console but couldn't. He stood up and shouted.

"What's going on?!"

Not expecting to be answered, someone spoke.

"What's wrong, Momonga-sama? Why have you taken the form of a human boy?" Albedo asked, kneeling down in front of him.

Momonga was surprised, an NPC was speaking to him like in a conversation. Her mouth was moving and making facial expressions no AI could have done in the game. And he was curious about the human boy she was talking about.

Reaching into a small black mist he opened and pulled out a mirror he saw what Albedo was talking about. He was back in his human form but with slight differences. His hair was white, eyes were pure black and a red glowing pupil.

'What is the meaning of this, Am I back?' He thought to himself.

"Momonga-sama? Momonga-sama?!" Albedo kept on calling out.

Pointing his attention to her he answered, "H-huh? My console isn't coming out."

Albedo apologized for not knowing what that is. Momonga was still amazed how he was communicating with her. If his guess is correct then he must be back in the real world.

"Sebas!" The Overlord called,

"Yes."

Hesitating if what is doing is okay he gave him an order.

"Sebas. Step out of the tomb and confirm the surroundings of Nazarick."

Sebas stood up from his kneeling position and said, "Understood, Momonga-sama."

"Pleiades, go with Sebas and get ready to intervene for possible intruders." Momonga Ordered to the maids.

All the maids stood up and Yuri Alpha, second-in-command replied, "As you wish, Lord Momonga." They bowed before they left.

Momonga was wrapping his head around how the NPCs are recognizing not specified orders. He took a glance at Albedo, who was smiling while looking at him, before resuming into his thoughts. He was thinking if he was really back and brought all what he has from the game in the real world wouldn't it mean that he is overpowered now? Can he even use magic now?

"So, Momonga-sama." Albedo said, getting Momonga's attention. "What should I do?"

"Let's see. Then, come here." The Undead Boy ordered.

Albedo replied "Yes" as she immediately came close. Momonga was surprised at how good she smelled. Then he realized that there was never a function like that when he was inside the game. He continued to investigate further and said and touched her, she had a pulse.

For one last test he asked her one risky request, "Albedo. C-can I touch your chest?"

"Huh?"

Momonga was panicking inside while also thinking that this was all necessary. That's right, he just has to ask her naturally.

"You don't mya… mind, do you?" Momonga asked, stuttering. It was impossible for him to do naturally.

"Of course. Please touch me as much as you please!" Albedo answered happily. Momonga was shaking a little as he slowly reached for her chest. As his teenage hands touch the Succubus's chest she let out a lewd tone.

Momonga assessed the situation while continuing to fondle the chest. He was further convinced that he was back in the real world while bringing along the guild base and NPCs. It was a few moments before he realized he kept on fondling Albedo. He felt like a hormonal teenage kid taking advantage of a kind Onee-san. He immediately stopped after realization.

"A-Albedo. I apologize."

"You're going to take me for the first time right here and now, right?" Albedo said, taking Momonga by surprise. She continued to talk about how she would remove her clothes.

The undead kid stopped her and they don't have time to do such things. Albedo apologized but deep inside Momonga's thoughts he could do his first time with an NPC and he was still too young. He forgave her and gave her an order to gather all guardians except for fourth and eight on the sixth floor within one hour.

After Albedo left, Momonga regretted how he dirtied Tabula's design but soon realized. 'Wait… I created them so it is fine… right?'

With the staff of Ainz Ooal Gown by his side, He proceeded to go to the sixth floor. He found out that he can use magic items. While walking, information about a new skill came flooding his thoughts.

"Blend Into?" it was a skill that made him or any NPC he created blend into the society and disguised their true nature. It also said that when he uses it on NPC that their age appears to match him in real life. The drawback is that their strength and abilities are reduced to a certain point. He noticed that his skill was currently activated.

"So that's why I look like my old self," Before he entered the sixth floor he deactivated the skill and turned him back to his skeletal form. The emotions he had disappeared. "I guess this is what being an undead really feels like."

The sixth floor, specifically at the amphitheater, is a large arena surrounded by several layers of an auditorium. This oval complex had a length of one hundred eighty meters on its long axis, a width of one hundred fifty meters on the short axis. As well as being the height of forty meters tall. It was modeled after the Colosseum of the Roman Empire. The audience consisted of numerous golems that acted as spectators.

In the middle of the arena he was greeted by Aura Bella Fiora and followed by Mare Bella Fiora, the dark elf twins. They are the guardians of the sixth floor. Aura is a girl but looked more like a boy and Mare was the opposite.

Momonga said that he would like to try some tests with the legendary Ainz Ooal Gown, and informed them the other guardians are coming. Aura was saddened when she thought of Shalltear coming too.

With some minor preparations, they set up training dummies at the arena and for tests. The Overlord concentrated on using magic without clicking the in-game icon he doesn't have anymore.

"Summon! Primal Fire Elemental!"

The training dummies were set to flames and an evil spirit that resembles that of a humanoid fire tornado was summoned in its place.

Momonga explained what it was and asked Aura if they would like to fight it. Aura was excited while Mare tried to escape but didn't. The magic caster ordered the summon to attack them and the battle commenced. The twins showed great attacks and coordination.

While they were fighting Momonga tried to use his message skill and it connected with someone, it was Sebas Tian. He asked how things were going outside and the butler answered.

"Well, there is a slight problem. It is currently storming outside and the Pleiades are currently engaging the trespassers around the mansion." Sebas answered back.

"What?! What do those trespassers look like?" Momonga asked, surprised someone with the information.

"Yes. Some are armed humans with facemasks covering them and others look like humans but with slight abnormalities with their body." The butler answered.

Momonga thought about it and remembered something, 'Terrorist with quirks?! So does that mean time stopped while I was in the game and came back the same time I left?!'. In a calm tone he gave his orders to the Butler.

"I see, proceed with caution and try to take some alive for questioning if possible." After that he asked him to come and report to him everything saw and that happened outside.

The battle of the dark twins and the Primal Fire Elemental just finished after communicating with Sebas. The Overlord praised the twins for their hard work and gave them refreshments. Soon after, the called guardians bowed and presented themselves in front of their Supreme Lord.

Momonga's eyes glowed bright red and was making an ominous aura while standing in front of them.

"Please bestow your orders upon us, Supreme One." Albedo asked, as all of the guardians waited in anticipation.

AN: That's it for the Prologue. My MC won't be as emotionless as the real Momonga because he will be in his half-human half-undead form more oftenly. He will however use his full Overlord form when he really needs it from grave or serious situations. Also thanks for reading and I just did this for fun. Have a good year everyone