Oga: The Eighth Inner of Kara

Aired in Japan between November and December 2022, the anime's twenty-fourth arc, The Labyrinth Game, covers episodes 274 to 281 and adds an eighth name to the list of the Inners of Kara. There Oga abducts travelers from the Thunder Rail and locks them inside an illusion run like a game, for a reason of her own: to observe in them the will to live that she has lost.

An Inner the manga never drew

Oga (オウガ) is an anime exclusive. She is a former Inner and scientist of the Kara organization, and only one debut date is known for her: episode 275 of Boruto: Naruto Next Generations, without a single entry on the manga side. She belongs entirely to The Labyrinth Game arc, the twenty-fourth arc of the animated series, which covers episodes 274 to 281 and aired in Japan between November 6 and December 25, 2022.

This late birth weighs on the reading: everything known about her in her own right fits into a single arc: the only chapter references her profile carries apply to all the Inners, and not one databook page is cited there. That arc sits between the academy arc of Kawaki and Himawari and the adaptation of Sasuke Retsuden, which makes it a self-contained interlude in the chronology of the animated series. The title of the final episode, "The Eighth Truth," announces the subject.

The physical description is brief: a girl of average height, with fair skin, large red eyes, and long brown hair reaching down to her lower back. As an Inner, she wears gray dresses and the Roman numeral "Ⅷ" tattooed on her forehead. The Kara page, for its part, describes the Inners' shared outfit as a black hooded coat with a colored lining, fastened at the right shoulder by a metal pin: an outfit her own profile never mentions.

What the Roman numeral VIII means

The numeral is not a rank. According to the explanations Oga herself gives in episode 281, the Inners' Roman numeral marks the order of creation, that is, of conversion into a cyborg. She describes herself as the eighth Inner created by Amado, which places her late in the series of modifications, well after the core group the manga puts on stage. The numbering therefore tells a laboratory timeline, not an internal hierarchy within the organization.

Two consequences follow from this rule. Kawaki, who received the same cybernetic modifications and bears the numeral "Ⅸ" under his left eye, was in all likelihood meant to become the ninth Inner; the Kara tables nevertheless place the boy destined for the Karma among the "other members," as a chosen vessel, never among the Inners. The same rule explains, in the same logic, the absence of a numeral on Amado's face.

The fact remains that the series of eight numerals does not have the same origin depending on the medium. The first six belong to the manga: Delta (Ⅰ), Kashin Koji (Ⅱ), Boro (Ⅲ), Jigen (Ⅳ), Victor (Ⅴ), and Code (Ⅵ). The next two are additions specific to the animated series: Deepa for the seventh, Oga for the eighth. A reader who knew only the chapters would therefore never find any trace of this eighth name.

The research on the human heart

Oga was not built to fight, but to assist a researcher. There is no ambiguity: she was first modified as the eighth Inner to serve as a research partner for the experiments of Amado Sanzu. The profile of Amado, like the one for Kara, spells out the sequence in the other direction, on the anime side: his work on the human heart runs into a dead end, and it is to break through it that he augments Oga's brain.

Her profile first applies to her the formula common to all the Inners — a body modified by Scientific Ninja Tools and by the DNA of Shibai Otsutsuki, two processes the manga documents in chapter 42 of Boruto and chapter 13 of Two Blue Vortex — before spelling out the essential point: only her brain was augmented, and she does not consider herself cut out for combat.

The reputation, for its part, is collective. Chapter 31 of the manga, page 3, calls the Inners monsters in terms of power, a phrase repeated for Oga even though her described abilities are mostly a matter of intelligence. The DNA graft from Shibai guarantees nothing, moreover: Amado transplants it without being able to predict which shinjutsu will awaken, or even whether a shinjutsu will awaken at all.

The brain broken by Jigen

When the research on the human heart stalls, Oga changes her subject of study and attempts to examine Jigen's heart. The punishment falls before she can flee: the act is treated as a betrayal, and part of her brain is destroyed. Who passed the sentence remains uncertain: two passages attribute it to Jigen, a third to Isshiki, the Otsutsuki lodged in the monk's body.

The injury has a precise effect, which is the whole engine of the character: it strips her of all will to live, and her body begins to degrade shortly afterward. The Kara page files the matter among the internal betrayals while adding a useful nuance: Oga's betrayal was unintentional, and the attempt to eliminate her failed. The Inners table, for that matter, classifies her under "defection," with no further detail.

It is from this punishment that she draws her method. She learned, from Jigen's example, the link between desires and vital force: a being deprived of desire falls apart. She deduces a protocol from it, that of observing in others the survival drive she has herself lost, in the hope that the spectacle will give hers back to her. Her abductions follow from this laboratory hypothesis.

The Thunder Rail abductions

The hunting ground is a train. The Thunder Rail is the railway network of the Kaminarimon Company, set up in Konoha about ten years after the Fourth Great Ninja War and extended as far as the Land of Earth and the Land of Wind. There Oga abducts travelers and places them under genjutsu in experiments that force them to act on their desire to survive, while taking part in them herself, in secret, to try to recover her own.

The scale of the disappearances eventually draws attention. Episode 280 introduces the Joint Investigation Team of the Five Great Nations, made up of shinobi from Konoha, Sunagakure, Kirigakure, Iwagakure, and Kumogakure to investigate major threats. Several elite jonin are sent in undercover: none come back. A single fragment of information makes it back, sent by a friend of Kiseru: a warning, trust nothing.

This thread leads to Kiseru Gankubi, presented as a Konoha Anbu infiltrated among Kara's Outers. His mission forbids him from revealing his identity, which makes him suspect in the captives' eyes and isolates him. Sarada will later recognize some members of the joint team as Anbu from the village, which one of the officials will confirm by invoking the clearance to share the intelligence.

The Labyrinth Game: five trials

The central tool has no official name: it is listed as "Labyrinth Genjutsu," a Yin Release technique classified both as genjutsu and as a Scientific Ninja Tool technique, first seen in episode 275. Oga links herself to several captives at once through it and builds rooms and landscapes at will, including places that exist in the real world, such as the Kara hideout, which she fills with traps.

The setup is run like a game. Twenty-one subjects are gathered; a preliminary test, the Nine Lives, offers ten cards, nine of which carry death and one life, and the Kirigakure shinobi who risks it draws the wrong one, which leaves twenty participants. Then come the five trials: the Collapse, the Light, the Pressure, the one with numbered cards to be gathered up to a total of at least seven, then a final trial. Only fourteen captives come out of the first.

There remains the point that changes everything: the deaths in the labyrinth are not real deaths. Those who die inside remain in suspended animation in tanks until the end of the genjutsu, and Oga considers herself more refined than the other Inners for that reason, since she kills no one. Two ways out exist: killing Oga inside, which would leave her in a coma on the outside, or removing the illusion scroll that powers the setup.

Yatsume and the old man

Inside the labyrinth, Oga plays two roles at once. The first is an old man who introduces and referees the trials, carried both by the genjutsu and by a puppet: small, deeply wrinkled, a broad smile missing several upper teeth, green eyes without pupils, long white hair and a white beard, brown clothes and a red cap with a yellow flap. On the Japanese voice cast side, the male puppet is entrusted to Kappei Yamaguchi, while Oga herself is played by Sara Matsumoto.

The second role is a kunoichi named Yatsume, who appears among the captives in order to observe the others up close. Her hairstyle is elaborate: ox horns on either side, tight braids underneath, two thick antenna-like strands falling over her face, and above all a white bandana that covers the Inner tattoo, over a closed light blue jacket and black shorts. The alias may be a shortening of yatsumeunagi (八つ目鰻), the lamprey, while Oga (横臥) means "lying on one's side."

This splitting in two requires real skill: her profile describes her as a skilled puppeteer, able to manipulate a disguised puppet from a distance, an art the Naruto universe usually associates with the puppeteers of Sunagakure. As Yatsume, she plays at camaraderie: she greets Boruto after he saves Shamo, tries to talk him out of climbing back down to the other captives, and races down the ladder to catch his hand when he nearly falls.

Lightning Release, Yin Release, and illusions

Her physical abilities are real but secondary. She does not consider herself made for combat, which takes nothing away from what she can do: holding the combined weight of Boruto and Shamo with one hand, climbing down a ladder fast enough to catch a fall, and smelling the blood on Rokuro thanks to a keen sense of smell. These are field skills, useful to someone who must pass for an ordinary captive.

On the ninjutsu side, two techniques of Lightning Release (Raiton) are listed. The Lightning Chains, first seen in episode 278, consist of wrapping chains around the arms in order to run lightning through to the kunai attached to them; the Electric Eels, in episode 280, require having one's feet in the water and electrocute anyone else standing in it. The rest of her technique list comes down to three entries: communication genjutsu, Labyrinth Genjutsu, and puppet technique.

The essential part lies in the chakra nature Yin Release. She projects fully realistic images of people over a distance, keeps her targets in suspended animation, and has entire scenarios held together by a scroll; if a subject realizes he is under an illusion, she immediately layers a second genjutsu on top that makes him believe he has just come out of it. A detail worth noting: when she uses the communication genjutsu, the fragments scatter in pink rather than blue.

Leaving the labyrinth

The mask falls during the final trial. After pretending to be contaminated by Rokuro's technique, Yatsume sees Boruto refuse to finish her off; it is the pain of the blows she deals him that teaches the boy they are still under an illusion. She then drops the role, declares herself Oga, and lays out her goal: stripped of any desire to survive, she wants Boruto to break the genjutsu by killing her in order to free everyone.

The refusal turns the scene around. As the construct collapses around them, Boruto does not give up on saving her, and the act of taking the hand he holds out is enough to bring her out of the genjutsu by her own means. She then frees the other captives. The moral effect of this stubbornness is spelled out: it makes her blush and gives rise in her to a dream she chooses to keep to herself.

The exit is discreet. Oga slips away before the others regain consciousness and entrusts to Shamo a letter addressed to Boruto, which he hands over to him: in it she challenges him to guess the dream in question and promises to come and see him one day. The Inners table stops there, on a simple mention of defection, and her profile records no later appearance.

Summary Table

FAQ

• Does Oga appear in the Boruto manga?
  No. Only the anime carries her, with just one debut date, episode 275; no chapter reference appears there. The Inners table also flags her as "anime only," just like Deepa, the seventh of the name, who appeared in episode 157.
• Why did Jigen destroy part of her brain?
  Because she tried to examine her leader's heart without authorization, once the research conducted with Amado on the human heart had come to an end with no result. The initiative was labeled a betrayal. Two versions coexist: two passages name Jigen, a third names Isshiki Otsutsuki, who occupies his body at that point.
• Do the labyrinth's captives really die?
  Not in the real world. Subjects killed inside remain in stasis in tanks until the illusion is stopped, something Oga takes a form of pride in. There are only two ways of interrupting the setup, one going through the death of its mistress inside, the other through the scroll that powers it.
• Does the numeral VIII indicate a rank in Kara's hierarchy?
  No: the rule comes from Oga herself, in episode 281, and refers to the order in which Amado turned each Inner into a cyborg. Hence the sequence Ⅰ Delta, Ⅱ Kashin Koji, Ⅲ Boro, Ⅳ Jigen, Ⅴ Victor, Ⅵ Code, before the two numbers added by the anime. Kawaki, marked with the Ⅸ, was never listed among the Inners.
• Can Oga fight?
  Her profile limits the augmentation to her brain and reports that she does not believe herself made for combat. It nevertheless credits her with strength, quick reflexes, a sense of smell able to detect the blood on Rokuro, and two Lightning Release (Raiton) techniques. Her real specialty lies elsewhere: the Yin Release nature, which covers both the Labyrinth Genjutsu and the communication genjutsu.
• What becomes of her at the end of the arc?
  She leaves the illusion at the same time as Boruto, ends the genjutsu for the other subjects, then disappears before they wake. Shamo passes on to the boy a letter in which she challenges him to guess the dream he brought into being and announces a visit. Her status in the Inners table comes down to a defection.

In summary

A laboratory Inner, not a combat one: augmented in the brain alone, Oga kills no one in her illusion and leaves The Labyrinth Game by way of the hand Boruto holds out to her, before slipping away with no later appearance on record.