Within the halls of the Nazarick, its denizens work tirelessly in the name of their creators, the Supreme Beings. Only one of the 41 Supreme Beings remained in the tomb. Said remaining Supreme Being is in the treasury, looking through the Guild's collection of weapons and magic items.
His name was Ainz Ooal Gown, Supreme Ruler of Nazarick, Overlord of undead, formerly named Momonga after renaming himself in the Guild's name. His appearance was that of a skeleton wearing an elaborate, jet-black academic gown adorned with gold and violet edges. Two large horns with red orbs protrude from the gown's hood. On his hands, he wore ten rings on each finger with different effects he can activate. Underneath his robe, he doesn't wear any clothing apart from his own gown; A shining red orb floats below his ribcage which grants him power on top of his already powerful necromancy.
Ainz walked through the treasury halls, admiring the many items the guild had accumulated throughout its existence. Reminiscing about the good old days before coming to the new world, it made him feel melancholic as he missed his old friends and wished they were with him.
"Haa… Seeing all these items makes me feel nostalgic of the old days in YGGDRASIL." Ainz thought to himself, "All of our blood, sweat, and tears were poured into the grind and it truly paid off in the end. Now, it all sits here in a lonely vault collecting dust, waiting to be used."
As he looked further into the collections, one item in particular caught his non-existent eyes. It was a flask containing a pink liquid sealed with a cork. He picked up the flask and closely examined it. The liquid swirled as the flask was moved.
"I don't remember this item being in the treasury…" Ainz thought, "What even is it?"
"[Appraise Magic Item]" Ainz said as he casted the spell, the flask glowed blue for a moment before fading.
"Secret Succubus Medicine?" Ainz said with curiosity, "The Mana of a Succubus concentrated into liquid? I've never heard of this item…"
"Unless this is some obscure item or a joke one, this must be a rarity." Ainz said, "Yet someone in the guild stored it here for safekeeping, but the spell never specified what it does…"
"Hmmm…"Ainz contemplated on whether to sate his curiosity by testing it or stow it back in the vault. Before he could decide, someone came in.
"Mein Schöpfer!" An eccentric voice called out, "What brings you here to the treasury?"
Pandora's Actor, Treasurer of Nazarick and Ainz's created NPC. Merely seeing or hearing him made Ainz internally embarrassed and cringe at what he created during his Chuunibyou phase. From the exaggerated gestures and body movements, along with the yellow Nazi German officer's uniform, he was the embodiment of everything he thought was cool. And he sometimes regrets creating him every now and then. His face was an egghead with three holes making a face, the true appearance of a doppelganger.
Ainz got startled by his creation's sudden appearance, causing him to clench his skeletal hand, forgetting the flask being held in it. The flask broke, spilling its contents on the floor and on Ainz's robe.
"Pandora's Actor! Don't startle me like that!" Ainz reprimanded his creation, "You made me break a fragile item!"
He points a bony finger to the broken flask and the spilled liquid on the floor, robe, and his hand. Pandora's Actor immediately prostrated before Ainz in a flamboyant manner.
"Forgive me, milord!" Pandora's Actor said, "I apologize for greeting you from behind!"
"It's fine, Pandora's Actor. I forgive you." Ainz forgave his creation to which the doppelganger was grateful and standing on his feet, "I was inspecting an item before you came in."
"Do you know what this item is, Pandora's Actor?" Ainz asked the treasurer, "I don't recall having it in the treasury before…"
"I am not sure and I might need to check the records…" Pandora's Actor said.
"See to it, and-hm?" Ainz looked at his hand, the pink liquid was brightly glowing and the light engulfed his hand. The light started to creep up his arm and towards his body. Ainz quickly started to cast spells to dispel the magic, yet none was working.
"Mein Schöpfer!" Pandora's Actor tried to help his master, yet Ainz held up his hand to stop his creation.
"Stay away, Pandora's Actor!" Ainz shouted as the light covered his torso and his other limbs, "It might affect you too if you touch me! So stay away!"
"[Emit Force]!" A magic circle appeared as the spell was casted. It created a shockwave that pushed the doppelganger away from Ainz, still standing as he slid back with arms raised to block the shockwave.
"Master!" The doppelganger called out to his creator, arm reaching out. The pink light shined brightly as it completely engulfed Ainz. Pandora's Actor covered his face with his arms as the light lit up like the sun. After a few moments, the light died down and the treasurer uncovered his eyes. His creator was lying face down unconscious and when he checked if he was fine, he was shocked.
What he witnessed after was something his mind would never forget in his life.
Ainz woke up from his unconsciousness as his vision returned. He found himself lying on a couch in the treasury's lobby. He sat up and rubbed his head as he shook off the mental pain in his mind. He looked around the lobby and saw Pandora's Actor pacing back and forth in the room with a book in his hands, panicky flipping through pages. Pandora's Actor looked up from the book and saw his master had woken up, rushing to their side.
"Mein Schöpfer! You're awake!" The doppelganger set the book down beside him and went to his creator's side, "Are you all right?"
"I'm fine-eh?" Ainz quickly noticed that his voice had changed and noticed his voice had changed pitch, sounding like a woman's. He then noticed his skeletal hands now had flesh and skin. Gray skin was present as he pulled up his sleeve and opened his robe. To his shock, what was once a skeletal body is now a fleshed one. Underneath his robe, he had a bone corset made from a ribcage on the chest and white loincloth on the body's lower half. Only then he noticed that his body had a woman's chest.
"Pandora's Actor… What's going on?" Ainz asked with an anxious tone, "What happened to my body?"
"Milord, er, Milady, please don't freak out on what you're about to see…" The doppelganger said, "It's best if you see it all for yourself…"
Ainz casted [Create Item], conjuring a full-body mirror in front of himself as he stood up from the couch.
Gazing upon what used to be a skeletal overlord was now a beautiful woman. Ainz's feminine body had gray skin, red eyes, and neck-length gray hair of a lighter shade. He then noticed that the red orb in his body was now embedded on the chest, unnoticed upon first look. Taking off the robes, he noticed the body was quite well-endowed with a modest chest and butt. The doppelganger looked away to preserve his master's privacy. Ainz put the robe back on before he got any intrusive thoughts about it.
Ainz turned to the treasurer and spoke.
"What exactly happened, Pandora's Actor?!" Ainz said in disbelief, "Why did this happen?"
"Well, it seemed that the flask containing the liquid Mana gave your body flesh." Pandora's Actor fetched the book on the floor, flipping through its pages, "When you passed out, I brought you here and I went through the index to find out what the item was."
He then handed the book to Ainz when he found the page describing the item.
"It seemed the item's purpose was to turn any heteromorphic race into 'monster girls' by exposure to a Succubus' Mana." The doppelganger explained, "It can also affect any female humans into 'monster girls' as well."
"Though I am quite unsure of its origins." Pandora's Actor finished his explanation.
Ainz read through the item's page in the index. Most of its contents was explained by Pandora's Actor, yet he missed one sentence in the page. At the bottom of the page, the sentence as reads:
This item was made in collaboration with Kenkou Cross's Monster Girl Encyclopedia.
Ainz didn't know what Monster Girl Encyclopedia was and hoped the Library of Ashurbanipal had answers. Ainz then asked Pandora's Actor a crucial question.
"Is the effect permanent?" Ainz asked if he was going to spend his entire existence as a woman.
"Unfortunately, yes…" Pandora's Actor sighed, "I tried dispelling it with the magic scrolls in the treasury yet nothing worked, not even the [Wish] spell worked."
The doppelganger once again prostrated before his master. In hopes of seeking forgiveness.
"Lord Ainz, please forgive me for ruining your perfect image!" Pandora's Actor begged, "My foolish action deserves the most grievous punishment! If not, then take my life in exchange!"
"Calm down, Pandora's Actor!" Ainz reassured his creation, "I am at fault as well. My curiosity got the best of me and had I known what its effect was, it wouldn't have happened. I forgive you, so please raise your head!"
"Thank you! Thank you, Master!" The doppelganger repeatedly bowed his head while prostrating, "As expected of a Supreme Being, your forgiveness knows no bounds to your subjects."
"I know, so please stand up!" Ainz ordered, "You're starting to creep me out!"
"Yes, master!" In a flash, Pandora's Actor stood up with exaggerated movement.
"Master, should I refer to you as Milady?" Pandora's Actor asked, "I believe it'll get confusing if I referred to you as a man."
"Considering the situation, I permit it." Ainz sighed as her eyes closed and pinched the bridge of her nose, overwhelmed by the event. "Have the Floor Guardians gather at the Throne Room. Tell them I have an announcement for them."
"Wenn es meine Göttin Wille! (If it's my Goddess's will!)" Pandora's Actor said in fluent German, saluting.
"What did I say about German!?" Ainz's face scowled at the doppelganger, radiating an aura of fear around herself.
"Apologies…" Pandora's Actor said before teleporting out of the treasury to carry out his master's will.
Ainz sighed to herself, pondering about her situation. She again looked at the mirror and saw herself. She had a human body once again. Her hands could feel anything she touches and could feel her smooth skin and hair. She could taste the teeth and saliva in her mouth. She felt the red orb in her chest, feeling the power it gave her. Her hands rubbed her abdomen then she suddenly thought of something.
"Could I get pregnant?" Ainz thought before a myriad of other questions went through her mind, "If I could, then… Ugh, this is confusing! I'll have to control my face when talking to others. It was easy when my head was a skull but with a face I'll have to be careful. One wrong act may affect how others see me."
"But first, to the Library." Ainz dispelled the mirror and used the [Ring of Ainz Ooal Gown] to teleport directly to it, "Find some answers. And after that, the Floor Guardians and then some experiments. If the changes in my body also affected my magic."
As the Overlord walked up to the Library's entrance, a notification box popped up in her vision. Ainz was surprised at its sudden appearance until he saw what it read.
"I've learned a new spell?" Ainz said, reading through its description.
"[Monsterization]: Infuse one or more targets with succubus mana to alter their form to a monster girl. If the target is a female human, their race changes into a random monster girl. If the target is a male human, their race changes into an Incubus." Ainz read, "If the target is a heteromorph or any non-human race, their race will change into its monster girl counterpart. The change is rapid and the effect is permanent. This spell can be casted as a single-target or as an AOE shockwave."
Ainz dismissed the notification and chuckled to herself. "How interesting. I'll have to test it later."
Entering the library, she began her research on Monster Girl Encyclopedia. What she found was a collection of Encyclopedias detailing monster girls, just like the name said. Ainz remained there for hours until he finished the last volume, feeling enlightened about everything she read. She could only think of only one person who could have a collection of erotic encyclopedias.
"PERORONCINO!" Ainz said in anger, her emotion suppression activated as it reached a threshold, calming her. "Of course, it would be him. Why am I not surprised…"
Ainz sighed before placing the books back on the bookshelves. The Elder Lich Librarian came in to see what's wrong, surprised at his master's new form. Ainz said everything's fine and dismissed him. Just as she expected, the potion was an event item from a collaboration event to promote the books.
"So to summarize, Monster Girls, 'Mamono' in the books, are hardwired to seek love and sex with men. They don't kill men and just have sex with them until they were forcefully transformed into Incubus and became their husbands. Women can become Mamono through sex with a Mamono or prolonged exposure to Succubus mana. All species of Heteromorphs and Humanoid races can become Mamono without exceptions. Each race has unique ways of seducing and procreating with men. And all feed off of the Essence of men which is just semen, though it varies depending on the mamono's diet." Ainz summarized what she read in her mind, "Yet I don't feel any of those desires… Is it because I'm a player or is it because the Mamono were under the control of a Succubus Demon Lord in the books? I believe the latter because the encyclopedia describes Mamono from a different world and I am not under anyone's control… So I guess things work differently in the New World."
Ainz received a message from Pandora's Actor using [Message].
"[Milady, the Floor Guardians are gathered in the Throne Room.] Pandora's Actor reported, "[They are all waiting for you.]
"[Thank you, Pandora's Actor.]" Ainz replied, "[I'll be there in a moment.]"
"Time to face the music." Ainz mentally prepared herself, "I hope Albedo and Shalltear don't get too sexual about my new form." She shuddered at the thought before teleporting directly to the Throne Room.
At the Throne Room, the Floor Guardians of Nazarick gathered at the command of the Supreme Being. With the exception of the Fourth and Eighth Floor.
Shalltear Bloodfallen, True Vampire and Guardian of the First, Second, and Third Floors.
Cocytus, Blue Insectoid warrior, Vermin Lord and Guardian of the Fifth Floor.
Aura Bella Fiora and Mare Bello Fiore, Twin Dark Elves and Guardian of the Sixth Floor.
Demiurge, Archdemon and Guardian of the Seventh Floor.
And lastly, Albedo, Succubus and Guardian Overseer of Nazarick.
They answered their master's call and gathered in the Throne Room as ordered. Pandora's Actor relayed a message for the Floor Guardians to rally at the Throne Room for an announcement.
"Sis, What do you think Lord Ainz is going to announce?" Mare asked his sister.
"It could be something important since he gathered all of us." Aura answered, "Still not sure what it is…"
"Perhaps. It. Is. Something. Concerning. Us." Cocytus said as mist blew from his mouth, "I. Still. Wonder. If. I. Could. Done. Better. With. The. Lizardmen."
"You tell me about failure…" Shalltear said, "Even though our lord had forgiven me, I still worked hard to wipe away my failure."
"Whatever the case, the lord has summoned all of us here for a reason." Demiurge said, "Lord Ainz wouldn't call us here without reason. Even with my intellect, I could only grasp a smidge of it!"
"Silence you all!" Albedo said, "As Demiurge had said, our lord had gathered us here for a reason. Even so, perhaps Lord Ainz had finally decided to make me his wife!"
"Shut it, Gorilla!" Albedo glared at Shalltear who scowled back at her, "If anyone's going to be his wife, IT'S ME!"
"YOU WANNA GO AT IT, LAMPREY!?" Albedo yelled back at Shalltear.
"I CAN TAKE YOU ON, YOU VIRGIN GORILLA!" Shalltear yelled back with an insult.
"YOU DARE!?" Albedo took offense with the insult.
Both women radiated powerful auras, red for Shalltear and purple for Albedo. Both ready to throw fisticuffs at each other.
"They're at it again…" Aura sighed as the two women were at each other's throats again. The remaining Guardians stayed out of the fight should it happen.
"Albedo! Shalltear! That's enough!" An unfamiliar voice commanding them to stop. Their rage suddenly dissipated at the order and wondered who it was. All of the guardians turned their heads at the source of the voice.
Standing near the throne was a gray-skinned woman. Neck-length light gray hair and red eyes, she was as beautiful as Shalltear. A red gem embedded on her chest and wearing a skeletal corset made from a ribcage. Most importantly, she was wearing Lord Ainz's robes and held the Staff of Ainz Ooal Gown.
It didn't take long for them to draw their weapons at the intruder. Albedo with her Halberd, Shalltear's lance, Aura and Mare's whip and druid staff, Demiurge's demonic claws and Cocytus held four different weapons with his four arms.
"Who are you?!" Albedo shouted, "And what have you done to Lord Ainz?!"
"Stand down, Albedo!" The woman released an aura of fear, one all too familiar to the guardians, "I won't have you wreck the throne room in your fight with Shalltear!"
"Lord Ainz, is that you?!" Albedo dropped her weapon in shock. The other Guardians were also shocked that the woman was their Lord Ainz.
"Yes, it's me." Ainz confirmed, "Put your weapons away. I feel like you're threatening me."
The Guardians obeyed and knelt before the Supreme Being.
"We obey, Supreme one!" The Guardians said in unison.
"Good." Ainz smiled, spreading her arms out dramatically, "Hear me, Guardians. I have brought you all here to gaze upon my new form! See it for all its glory!"
"We shall!" They said in unison, "All hail the Supreme Being! All hail Ainz Ooal Gown!"
With one accident, a new age began in the world. An age of peace, love, and probably lots of debauchery.
