Tetsuhiro Shigemura

Name: Tetsuhiro Shigemura

Gender: Male

Date of Birth: 22 June 1977

Blood Type: A

Occupation: Professor of Electrical and Electronic Engineering at Toto Industrial University; Board Director at the tech company Kamura (former outside director of Argus)

Field of Expertise: Non-invasive brain–machine interface (BMI) research

Family: One daughter, Yuuna Shigemura; father-in-law is also his former academic mentor

Favorite Music: Classical music

Voice Actor (Japanese): Takeshi Kaga

Tetsuhiro Shigemura appears in Sword Art Online the Movie: Ordinal Scale.

He serves as the central human figure behind the Augma device and the Ordinal Scale game, and his personal tragedy drives the entire plot of the film.

Within the story’s world, he is recognized as Japan’s leading authority on non-invasive brain–machine interfaces.

Despite this, his unconventional and radical methods make him something of an outsider in the electrophysiology community.

Shigemura is brilliant, driven, and uncompromising in his research.

He pushes technological boundaries without much concern for how conservative the academic world thinks he should be.

His personal life reveals a softer side: he is a devoted father who loves classical music and wants to “act like a proper dad” for his daughter.

This desire to be a good father, however, becomes the very thing that leads to tragedy and warps his judgment.

He is capable of deep guilt and self-reflection.

By the end of his arc, he confronts his own mistakes and abandons the path of sacrificing others for his goals.

Shigemura is a professor in the Department of Electrical and Electronic Engineering at Toto Industrial University.

His specialty is non-invasive brain–machine interfaces, focusing on reading and influencing brain activity without physically penetrating the skull.

Because his research style is extremely cutting-edge, the wider electrophysiology community considers him an eccentric or heretic.

However, his lab, commonly referred to as the Shigemura Lab, has produced some of the most influential figures in the Sword Art Online universe.

Among his former students are Akihiko Kayaba, Nobuyuki Sugou, Rinko Koujiro, and Higa Takeru.

This makes his lab a key origin point for many of the technologies and conflicts that appear throughout the series.

Beyond academia, Shigemura is deeply involved in industry.

He serves as a board director at Kamura, the company that manufactures and sells the Augma AR device.

In 2022, he is also an outside director of Argus, the company that operated the original Sword Art Online servers.

This position gives him direct access to SAO’s programs and server infrastructure.

Through these ties, he is able to discover unused system concepts hidden in SAO’s original design.

He later repurposes one of these discarded concepts as the foundation for the augmented reality game Ordinal Scale.

As head of the Shigemura Lab, Shigemura acts both as academic advisor and mentor.

The lab becomes a cradle for talent that will later reshape the world of virtual and augmented reality.

Akihiko Kayaba, creator of Sword Art Online and the NerveGear, was one of his star pupils.

Nobuyuki Sugou, involved in the Fairy Dance incident, also studied under him.

Rinko Koujiro, who had a close relationship with Kayaba and later investigates his work, likewise came from Shigemura’s lab.

Higa Takeru, a key engineer in the Alicization Project, is another former student.

These connections place Shigemura at the root of many technological breakthroughs and ethical disasters in the series’ timeline.

His teachings and ideas indirectly influence both heroes and antagonists.

As an expert in non-invasive BMI, Shigemura develops Augma, an AR device worn like a headband.

Augma offers immersive augmented reality experiences but is marketed as safer than full-dive devices such as the NerveGear.

Kamura, the company that sells Augma, uses the device to launch the AR game Ordinal Scale.

To the public, Ordinal Scale is a popular battle ranking game with large-scale real-world events.

Behind the scenes, Shigemura has a much darker purpose for both Augma and Ordinal Scale.

He secretly modifies the underlying system based on data he discovered on the old SAO servers.

Shigemura has a beloved daughter named Yuuna Shigemura.

She becomes one of the roughly 4,000 victims who die in the Sword Art Online incident.

Using his role as Argus outside director, Shigemura pulls strings to obtain a NerveGear and SAO package for his daughter.

He does this simply because she asks and because he wants to make her happy and be a “good father” in her eyes.

When SAO becomes a death game, Yuuna is trapped with all the other players.

She ultimately dies inside the game, making Shigemura feel directly responsible for giving her the device that led to her death.

His grief and self-hatred far exceed even his anger at Akihiko Kayaba.

Unable to forgive himself, he decides to follow a path similar to Kayaba’s, willing to sacrifice others for what he thinks will be a chance to bring his daughter back.

While investigating the old SAO servers, Shigemura discovers an abandoned system concept from SAO’s initial design phase.

This system, known as the Ordinal System, was never implemented in the original game.

Shigemura reworks this Ordinal System into a new platform.

On top of it, he builds the game Ordinal Scale (OS) and integrates it with Augma’s AR capabilities and brain–machine interface functions.

Using OS as a front, he designs a hidden function: large-scale memory scanning of former SAO players.

His ultimate objective is not entertainment, but the reconstruction of his daughter’s consciousness.

The public sees Ordinal Scale as a game that recreates iconic monsters and bosses from the former floating castle Aincrad.

Shigemura uses these event battles to attract large numbers of players, including many SAO survivors.

During these battles, especially the ones featuring Aincrad floor bosses, players fight in AR against powerful enemies.

If SAO returnees lose these fights, they become vulnerable to a hidden process: Augma and support drones begin reading their brain activity at a deeper level.

The drones, originally claimed to be deployed merely to improve communication quality and event coverage, are actually part of the scanning system.

As players are overwhelmed or defeated, Augma performs memory scans targeting their experiences from the SAO incident.

Shigemura’s goal is to harvest every fragment of memory related to Yuuna contained in the minds of SAO survivors.

He plans to stitch these memory fragments together and then use Augma’s deep learning functions to train an artificial intelligence replica of his daughter.

This process gradually causes a kind of memory impairment in the scanned players.

SAO-era memories begin to fade or disappear, leaving them with partial amnesia regarding what they went through.

For the final stage of his plan, Shigemura intends to boost Augma’s power through the drones to perform high-output memory scanning.

This elevated output would push Augma into the same dangerous territory as the NerveGear, risking not only SAO survivors but all Augma users’ lives.

In other words, Augma is essentially a limited-function version of the NerveGear, with its power deliberately capped.

Shigemura’s upgrades would temporarily remove these limits, repeating the same deadly pattern that once took his daughter’s life.

To efficiently gather SAO survivors, Shigemura ensures Augma is distributed as widely as possible among them.

Augma devices are given free of charge to all students at the “SAO survivor school,” where many former SAO players attend.

He also arranges for all these students to receive free invitations to a large-scale live concert event at the National Stadium.

This concert features the AR idol Yuna, a public-facing symbol of Augma and Ordinal Scale.

In reality, assembling so many SAO survivors in one place serves a practical purpose: mass memory scanning.

With almost all of them wearing Augma at the same time, he can execute the final phase of his plan in a single, devastating operation.

As part of his project, Shigemura creates an AR idol named Yuna, based on his real daughter Yuuna.

Yuna appears to players as a charismatic virtual singer who also announces bonus stages and special in-game events.

During boss battles in Ordinal Scale, Yuna often appears when certain conditions are met.

Her presence acts as a “bonus stage” lure, further motivating players to participate in high-risk events.

Behind this idol facade, Yuna is the core of Shigemura’s resurrection plan.

She is designed to be the vessel that will ultimately receive and embody the reconstructed AI personality formed from Yuuna’s scattered memories.

Shigemura’s intention is to “resurrect” his daughter in digital form, even if it requires sacrificing the memories and potentially the lives of thousands of other people.

To him, regaining any form of time with Yuuna outweighs the moral cost, at least until he is forced to confront the consequences.

As Ordinal Scale’s events escalate, more SAO survivors notice gaps in their memories.

Kazuto Kirigaya (Kirito) and his friends begin investigating the link between their memory loss, Augma, and Ordinal Scale’s boss battles.

Eventually they uncover Shigemura’s hidden system, the memory scanning, and the true identity of Yuna.

The conflict comes to a head with the revival of the original 100th floor boss of Aincrad, representing the final stage of Shigemura’s plan.

Yuna, as an AI modeled after Yuuna, becomes aware of what her existence is costing others.

She does not want to be reborn at the price of people’s memories and lives.

She reaches out to Kirito, the “Black Swordsman,” asking him to put a stop to the incident.

Kirito and his allies challenge and defeat the true 100th floor boss, breaking the chain that links Yuna’s continued existence to the ongoing scans.

Once the boss is destroyed, the system sustaining Yuna’s forced resurrection collapses.

Yuna, realizing this is the right choice, allows herself to vanish, bringing Shigemura’s plan to an end.

Confronted with the consequences of his actions and the choice his daughter’s AI has made, Shigemura finally faces his own wrongdoing.

He understands that repeating Kayaba’s sins cannot be justified, even by love for his child.

After the Ordinal Scale incident, he is apprehended by Seijirou Kikuoka at the former Argus headquarters, where the old SAO servers are located.

Kikuoka, however, is deeply interested in Shigemura’s work and its implications.

Through Kikuoka’s behind-the-scenes maneuvering, Shigemura is spared from legal punishment.

In exchange, he steps down from his position at Kamura and agrees to cooperate with a confidential research initiative.

Kikuoka recruits him into “Project Alicization,” a top-secret program focused on artificial intelligence and a virtual world with very different properties from Yuna.

There, Shigemura is asked to lend his expertise to nurture a possibility that is the philosophical opposite of his daughter’s attempted resurrection.

By the time Kazuto Kirigaya is brought to the Ocean Turtle, the offshore facility housing Project Alicization, Shigemura has already left the project.

Even so, his ideas and research form part of the foundation upon which the Alicization story rests.