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"Let's hit them before thinking about whether you can win."
Yamaiko's combat doctrine, passed to Yuri Alpha.

Yamaiko (やまいこ) is one of the three female guild members of Ainz Ooal Gown and regarded as one of the Forty-One Supreme Beings by the NPCs of the Nazarick. She is the older sister of Akemi and the creator of Yuri Alpha, Decrement, and Increment.


Yamaiko is a Nephilim just like Warrior Takemikazuchi.


Yamaiko was described to have a kind and gentle personality. She talks politely and has a friendly relationship with her guild members. However, she tends to act before thinking things through first, eventually leading her to earn the title: muscle brain sensei.

While so, she has a tremendous mental fortitude despite people comparing her to her young sister. According to Momonga, being the teacher as she is, Yamaiko often said that children were a treasure to her which she wants to educate, protect, and look after.[1]

True to Yamaiko's nature, she views the world's social inequalities in real life to be wrong and would constantly voice her opinion on the subject.


In real life, Yamaiko is an elementary school teacher in the arcology. According to Maruyama, Yamaiko’s full name happens to be Yamase Maiko.[2]

At some point in time, she joins the Nine's Own Goal clan before it was later disbanded and reformed as the guild of Ainz Ooal Gown.

She has a genius little sister and was constantly compared to her. She and her younger sister, Akemi played YGGDRASIL together. While her younger sister chose to be an elf, Yamaiko chose to become a Nephilim.[3]


The Undead King Arc

Main article: The Undead King Arc

While walking back to Carne Village after defeating the Sunlight Scripture, Ainz reminisces about the past where he after countless tries was finally able to get a super rare cash shop item from Gachapon. However, his joy was short-lived after he learned Yamaiko got her’s on the first try.[4]

The Bloody Valkyrie Arc

Main article: The Bloody Valkyrie Arc

Ainz remembers that he gambled his entire bonus away just to obtain the Shooting Star. Amongst all the guild members, only he and Yamaiko possess this item.[5]

Later, Ainz used Yamaiko's Female Sensei's Iron Fist of Wrath in the battle against Shalltear Bloodfallen.[6]

The Two Leaders Arc

Main article: The Two Leaders Arc

After seeing both Mare and Albedo are equipped with the Ring of Ainz Ooal Gown, Ainz starts to recall what Yamaiko had once told him about the meaning of wearing a ring on different fingers. Through Yamaiko, he learned that there was a practice which originally hailed from ancient Greece. Apparently, she told Ainz that the ancient Greeks believed there was a blood vessel which ran from the left ring finger to the heart. While so, she goes on to say that if the left ring finger touched something harmful to the body, it would send a signal to the heart. Hence, Yamaiko explains that this was why they dispensed medicine with their left ring fingers in the first place.[7]

The Dark Hero's Story Arc

Main article: The Dark Hero's Story Arc

As Ainz told Narberal that there is no point in getting worked up over the actions of their client Torkel, the latter made no objections to his answer and accepts it accordingly. When Narberal was given an order by Ainz to be honest about her thoughts and intention, she believes it was necessary for them to correct Torkel's childish behavior even by force if needed. Hearing her response, Ainz acknowledged the fact that educating children should be something his guild member, Yamaiko is good at since she is a teacher.

At the same time, Ainz wonders what Yamaiko would have done if she instead of him was in this kind of situation. Along the way, it caught Narberal by surprise from his answer as she enthusiastically proclaimed her name to be one of the 41 Supreme Beings who created her older sister Yuri Alpha. However, Ainz came to the sudden realization that the things that he used to talk with Yamaiko about at some point in the past, even until now are disappearing from his mind. In a way, Ainz felt there was once a time where the two discussed such private topics together, but knowing that it occurred so long ago, he had forgotten quite a lot of them.[8]

The Men in the Kingdom Arc

Main article: The Men in the Kingdom Arc

Ainz reminiscences about the argument between Touch Me and Ulbert Alain Odle. Touch Me remembers that Yamaiko needs a rare drop from the Fire Giant Boss, but she doesn't particularly need it right now before the continuation of the argument between Touch Me and Ulbert.[9]

The Ruler of Conspiracy Arc

Main article: The Ruler of Conspiracy Arc

Ainz thought what sort of reaction Yamaiko would act around her NPCs if she learned about them developing their own egos. He described that Yamaiko will probably try to meet with her creations like Yuri Alpha out of curiosity.[10]

The Craftsman of Dwarf Arc

Main article: The Craftsman of Dwarf Arc

When Ainz frighteningly thinks about the number of powerful foes, he believes that one can not proceed without punching them first to see what the enemy has up their sleeve. At this point, he thought the spirit of Yamaiko is beginning to possess him.

Ainz remembers a guild called the Millennium Kingdom in YGGDRASIL, pondering what kind of answer would most likely be suitable for a king in response to Demiurge's question. While at the same time, Ainz has also came across this topic before and that he has once spoken about it to one of his former guildmates, Yamaiko, during their time together. She discusses the subject regarding Cranes and why a guild like the Millennium Kingdom has an emblem similar to that creature. Afterwards, Yamaiko begins telling him that it was because Cranes are known to live for a thousand years according to mythology.[11]

The Witch of the Falling Kingdom Arc

Main article: The Witch of the Falling Kingdom Arc

After destroying the Re-Estize Kingdom, Ainz looking for a way to briefly escape ruling the Sorcerer Kingdom though of using sending Aura Bella Fiora and Mare Bello Fiore away to make friends. He wondered if he was pushing too much work onto them, which was the norm back in his world, Yamaiko, however, would have disapproved.[12]

Abilities and Powers

Yamaiko is a type of magic caster who was adept at spirit-type magic, and she had further specialized within that field as a healer, which granted her curative spells. Even wands imbued with high-tier spells would only heal about half as much as Yamaiko could if she personally cast a healing spell. She could also transfer MP to another person via the appropriate spell. With her innate defenses and regeneration, combined with a build which emphasized those two qualities, she could serve as a tank of sorts for her party members. Despite Yamaiko being surrounded by enemies, she could still heal her allies.

However, Yamaiko possesses two kinds of weaknesses based on her character build she specialized in. The first kind was that she did not have much MP. Even though she had more than enough for general healing, it was still insufficient when one factored in the need to cast buff spells and other things altogether. Secondly, the other weakness was that her attack power was very low, in exchange for improved regeneration. She was considered to be the final defensive line of the group. Her role was to off-tank if the battle line started to crumble, heal everyone’s wounds, and revive dying comrades.

Nonetheless, Yamaiko was the kind of Nephilim, who banked on her race's ability to take two very high ability scores and three very low ability scores to maximize her spirit and endurance. In addition, she was fully equipped with gear that abandoned offense to focus on defense. In combination with her regenerative abilities, she was far more survivable than even a half-baked tank class.[13]


  • Field of Force
  • Greater Lethal: A spell that causes damage with negative energy.
  • Sanctuary Protection

Super Tier Magic

  • Judgement of Osiris: A super-tier spell which allows the user to manipulate karma values. By doing so, it is capable of reducing negative values and increasing positive ones.
  • Wish Upon A Star: A super-tier spell which consumes the user's experience points to grant a wish or more. Yamaiko is able to gain access to it by using a special item known as Shooting Star.

Main Equipment

  • Female Sensei's Iron Fist of Wrath: Her weapon of choice is a huge gauntlet that could not do much damage. In exchange, it had an increased ability to inflict knockback on her foes.
  • Ring of Ainz Ooal Gown: It allows the user to freely teleport between every room inside Nazarick. Every member of Ainz Ooal Gown was required to wear this ring.
  • Shooting Star: With the ring equipped, it allows her to activate "Wish Upon a Star" three times without consuming experience.

Consumable Items

  • Wands and Staves: Used for healing.
  • Cash Shop Items: She uses an Hourglass to instantly cast "Judgement of Osiris" during her battle with Asura.



Back then in YGGDRASIL, they used to chat about private topics. However, due to the passage of time, Momonga seems to forget the things she says in the past, which is something he begins to regret later on. Every once in a while, when trying to teach the Guardians, Momonga wonders what Yamaiko would do in such a situation, showing he still highly respects her skills as a teacher.

Momonga was a bit jealous of Yamaiko because she easily obtained the Shooting Star from a gacha machine in her first try while he had to be the one who gambles his entire summer bonus away just to obtain this item. This impact still left some trauma in Momonga's heart.


Yamaiko had a friendly relationship with her. They called each other by nicknames. Yamaiko said that there was no need for her to sound like a cute child because her normal voice was already pleasant enough, which Bukubukuchagama jokingly replied that she fell in love with her. They worked in the same team to clear the Great Tomb of Nazarick. Yamaiko trusted her skills as a gamer and would follow her instructions.

Ulbert Alain Odle

They worked in the same team to clear the Great Tomb of Nazarick.

Warrior Takemikazuchi

They worked in the same team to clear the Great Tomb of Nazarick.


They worked in the same team to clear the Great Tomb of Nazarick.


Akemi is Yamaiko's younger sister. In the past, due to Yamaiko's connection to the guild of Ainz Ooal Gown, Akemi was allowed a special tour into the Great Tomb of Nazarick. Her little sister deeply admired her.

Yuri Alpha, Increment & Decrement

Yamaiko is the creator of Yuri Alpha, Increment and Decrement. As such when compared to all the 41 Supreme Beings of Ainz Ooal Gown, Yamaiko is the one they harbor the most loyalty, reverence, care, and love above all others. If given the order by her, they will likely turn against the other 40 members of the guild for her sake.

Due to being their creator and Yamaiko's own personality as a teacher, Yuri Alpha and Increment have both shown to have inherited their creators strict, polite, reserved, and friendly personality traits from her. This includes having seemingly inherited their Creator's love for reading quietly and her apparent workaholic tendencies.

While on the other hand, her other creation Decrement, is seemingly shown to have inherited Yamaiko's more energetic personality traits.

Ankoro Mocchi Mochi

As one of the only three female guild members, they were good friends.


  • Yamaiko originally intended to change her avatar character, but so far her actions suggested otherwise.
  • She and Momonga are the only members in Ainz Ooal Gown who possess the item Shooting Star.
  • In the past, one of her female kouhai confessed to her. That kouhai loved to make trouble and she kept arguing with her sister, Akemi.
  • Let alone Momonga, Yamaiko is the second person known in Overlord series to have actually cast Super-Tier Magic and had one of its spells fully identified by name.
  • Yamaiko earned the nickname of Gacha God, due to her immense luck. Her guildmates even created the Yamaiko Shrine, both as a prank, but also to embrace some of her good fortune.[14]
  • Yamaiko is the one who gifted Yuri her glasses.[15]


  • (To her Guild Members): "I forgot my opponent's data, so let's just punch them and run away if they're very strong."
  • (To her Guild Members): "Still, I feel that it's a waste to completely abandon our current clan name. It would be nice if we could pick a new name that had some relation to the old one."
  • (To Bukubukuchagama): "It seems you're always trying to sound like a cute kid when there's no need to. Your voice as Kazecchi is pleasant enough, so there’s no need for that, right?"
  • (To Bukubukuchagama): "In the past, I'm not sure if it was because I said the wrong thing, but one of my female kouhais actually confessed to me for real. So I hope you'll give me a break here."
  • (To Bukubukuchagama): "Mm. Come to think of it... nothing good came of it at all. That kouhai of mine loved to make trouble... and she kept arguing with my little sister. What a headache."
  • (To Bukubukuchagama): "Well, it would be good if it was like that. For all you know, that troublesome kouhai might have gotten married, and became a wife and mother."
  • (Yamaiko's words retell by Yuri Alpha): "Too much cramming is unproductive."


  1. Overlord Bonus Volume Chapter 2: The Two Set Off
  2. Syosetsu: Misc Blog Info 3.51
  3. Overlord Blu-ray 06 Special Character Sheet: Yamaiko
  4. Overlord Volume 01 Chapter 1: The End and the Beginning
  5. Overlord Volume 03 Chapter 3: Confusion and Understanding
  6. Overlord Volume 03 Chapter 5: PVN
  7. Overlord Volume 08 Side Story 2: A Day in Nazarick
  8. Overlord Volume 06 Special Drama CD: The Dark Hero's Story Arc
  9. Overlord Volume 06 Chapter 6: Prelude to the Royal Capital's Disturbance
  10. Overlord Volume 10 Chapter 1: Sorcerer Kingdom of Ainz Ooal Gown
  11. Overlord Volume 11 Chapter 5: Frost Dragon Lord
  12. Overlord Volume 14 Epilogue
  13. Overlord Blu-ray 06 Special: Overlord Prologue (2nd Half)
  14. Overlord: The Undead Oh! Chapter 55
  15. Overlord: The Undead Oh! Chapter 75


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Click on the images to enlargen them.

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Ainz Ooal Gown
MomongaTouch MeNishikienraiWish IIIWarrior TakemikazuchiAncient OneFlatfootAmanomahitotsuPeroroncinoBukubukuchagamaHeroheroBlue PlanetUlbert Alain OdleGarnetBellriverVariable TalismanNearataNuboGenjiroYamaikoWhitebrimPunitto MoeTabula SmaragdinaBeast King MekongawaTigris EuphratesTemperanceSuratanAnkoro Mocchi MochiShizyuutensuzakuLuci★FerCoup De Grâce