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Missing Information: Appearance, Alicization Arc Chronology, proper chronology for other arcs
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Kikuoka Seijirou (菊岡誠二郎, Kikuoka Seijirō?), known as Chrysheight (クリスハイト, Kurisuhaito?) in «ALfheim Online» (ALO), is a supporting character in the Phantom Bullet Arc and Alicization Arc, as well as a reoccurring character throughout the Sword Art Online series. He allegedly works for the Ministry of Internal Affair's Telecommunications Bureau, Advanced Network Division, Second Office (the «Virtual Division»)[4] and, at some point after the end of the Sword Art Online incident, began playing ALfheim Online for research purposes. However, Seijirou is actually a Lieutenant Colonel of the Japan Ground Self-Defense Force, who voluntarily transferred over to the Ministry of Internal Affair's Telecommunications Bureau for the sake of his plans on Project Alicization.[5]

Appearance[]

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Kikuoka Seijirou Full Body

Background[]

Kikouka Seijirou was an investigator in the «Sword Art Online Case Victims Rescue Force», and the one who told Kazuto which hospital Asuna was in.[4][6] Though he is stated to be part of the virtual division, Kazuto suspects he is part of the JSDF after tailing him.[7] He takes advantage of Kazuto's gratitude by using him as an investigator for issues, and uses other people like watchdogs over the VR network.

Seijirou was also one of the original 1,000 beta testers for the original Sword Art Online. However he did not transfer over to the full version of Sword Art Online because he realized that the technology could be used for more than just military training programs and started working on Project Alicization.[5]

Chronology[]

Extra Edition[]

Kikuoka4

On July 25, 2025, Seijirou had the SAO Survivor School organise an emergency counseling session with Kazuto, to his surprise, in order to gather more information regarding the events of SAO, and its aftermath. The game's logs only displayed the locations of players at certain times and, with Kayaba Akihiko's death, Seijirou wanted to hear Kazuto's story. Kazuto, after informing Seijirou that he had to be somewhere later, agreed to tell him everything that happened: from the incidents in SAO, to Kirito's "victory" over Heathcliff, and then explained the situation after he discovered that Asuna, along with 300 other SAO players, was trapped by Sugou Nobuyuki, and how he came to locate her in ALfheim Online.

Seijirou was later seen calling Kazuto through his cellphone.

Phantom Bullet Arc[]

On December 7, 2025, Seijirou invited Kazuto to meet with him in a cafe, where he introduced the Death Gun problem to him. The two debated how Death Gun could kill through the tamper-proof, safety-conscious AmuSphere, concluding that such a feat was impossible. However, Seijirou convinced Kazuto to investigate the matter for a sizeable reward.

After the death of Pale Rider on December 14, Seijirou was contacted by Asuna and requested to log in to ALfheim Online, where he was questioned by her to discover the true reason behind Kazuto converting his avatar to Gun Gale Online. After extreme pressure, Chrysheight revealed everything to Asuna.

In the resolution, Seijirou met with Kazuto and Asada Shino on December 16 for a debriefing of the incident and apologized for the danger.

Alicization Arc[]

Alicization Running[]

On July 5, 2026, it was revealed that he was a Lieutenant Colonel from the Japanese government's Self-Defence Force, and was in charge of Project Alicization. He oversaw its conception and formulation, directing the soul cloning of newborn babies and then the acceleration of the Underworld society.

It was also revealed that he had taken advantage of the «Gun Gale Online Incident» to form a relationship with Kazuto. His true goal was revealed to have been enlisting Kazuto's help for Project Alicization.

Alicization Uniting[]

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Alicization Invading[]

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Alicization Exploding[]

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Gallery[]

See Kikuoka Seijirou/Image Gallery

Trivia[]

  • Seijirou is a man who likes talking about disgusting things. For example, he excitedly talked about the making of a Kiviak in great detail in a cafe.[4]
  • Seijirou's character name, Chrysheight, which is formed from the English words «Chrysanthemum» and «Height»[8], comes from Seijirou's family name, Kikuoka (菊岡?), which is written using two kanji: Chrysanthemum (, Kiku?) and height (, oka?).[9]
  • Chrysheight's skill as a mage in ALfheim Online is acknowledged by General Eugene.[4]
  • In the web novel version, all of Seijirou's family members died when he was a baby in the 1980s due to an air traffic incident. According to Kirito's memory, one of the proposed causes for the incident was a fighter misfiring a missile.

Notes[]

  1. This entry is based on a tentative list by the author that has neither been confirmed nor denied as final.

References[]

Navigation[]

Characters
Major Characters
Alice Zuberg - Asada Shino (Sinon) - Ayano Keiko (Silica) - Eugeo - Kayaba Akihiko - Kikuoka Seijirou - Kirigaya Kazuto (Kirito) - Kirigaya Suguha (Leafa) - Shinozaki Rika (Lisbeth) - Tsuboi Ryoutarou (Klein) - Yui - Yuuki Asuna (Asuna)
SAO Players
Aincrad Liberation Force/ALS Hokkaiikura - Joe - Kibaou - Kobatz - Liten - Melonmask - Okotan - Schinkenspeck - Thinker - Yulier - Yakumo
Divine Dragon Alliance/DKB Buxum - Hafner - Lind - Morte - Schmitt - Shivata - Yamata
Fuumaningun Isuke - Kotaru
Fuurinkazan Dale - Dynamm - Harry One - Issin - Klein - Kunimttz
Golden Apple Caynz - Grimlock - Griselda - Schmitt - Yolko
Knights of the Blood Asuna - Daizen - Godfree - Heathcliff - Kirito - Kuradeel - Nautilus
Laughing Coffin Johnny Black - Kuradeel - Kuro - PoH - XaXa
Legend Braves Beowulf - Cu Chulainn - Enkidu - Gilgamesh - Nezha - Orlando
Moonlit Black Cats Ducker - Keita - Kirito - Sachi - Sasamaru - Tetsuo
Titan's Hand Rosalia
Two-Handed Builders Agil - Lowbacca - Naijan - Wolfgang
Others Argo - Ashley - Ceba - Coper - Diavel - Gin - Gwen - Kein - Lisbeth - Lux - Mina - Mito - Nishida - Rossa - Ryufior - Sasha - Silica - Yuna
Beta Testers Argo - Coper - Diavel - Isuke - Kirito - Kotaru - Mito - Morte
NPC Angel - Kizmel - Leyshren Zed Yofilis - Lion - Myia - NPC Orchestra - Pina - Ruru - Scarecrow - Theano - Tilnel - Tin - Toto - Yui
Non-Canon Aaaa - Ado - Alberich - Alice Zuberg - Ceniza - Clumy - Cocoa - D.I.L - Eugeo - Fer - Fuego - Garcia - Idhrendis - Knakia - Koharu - Lapis - Leafa - Leuer - Linhua - Mariah - Mater - Mikiha - Miyurin - Notte - Oculus - Philia - Protagonist (Integral Factor) - Rain - Rano - Sanya - Seeda - Sinon - Stilla - Strea - Typhon - Ulrik - Vela - Vecta - Wendelin - Yuuki
ALO Players
Cait Sith Adie - Alicia Rue - Silica - Sinon
Gnome Agil - Tecchi
Imp Yuuki
Leprechaun Ceba - Granze - Lisbeth - Talken
Pooka Sasha
Salamander Eugene - fastuosa - Gtacs - Jun - Kagemune - Klein - Mortimer - UxperXJ
Spriggan Kirito - Kuro - Nori
Sylph Erika - Fukaziroh - Leafa - Lux - Recon - Sakuya - Sigurd
Undine Asuna - Chrysheight - Siune - Thinker - Yulier
NPC/Navigation Pixie Angel - Emely - Hraesvelg - Leviathan - Nerakk - NPC Orchestra - Pina - Skuld - Thiazi - Thor - Thrym - Tonky - Urðr - Verðandi - Yui
Others/Unknown Ashley - Fairy King Oberon - Garnet - Gwen - Marinca - Saitou Shouichi - Slug Researchers
Non-Canon Alice Zuberg - Argo - Black Lotus - Eugeo - Heathcliff - Persona Vabel - Philia - Rain - Sachi - Seven - Strea - Sumeragi - Yuna
GGO Players
Dyne's Squadron Arashi - Dyne - Ginrou - Jin - Miso - Sinon
BoB Participants Blackwood - Colonel Liberty - DA*LU - Dyne - E.J. - Fernil - Garrett - huuka - Jack Reacher - JIGEN - Kakouton - kaeeeede - Kakameposu the II - Keith - Kirito - Lion King Richie - Masaya - Musketeer X - No-No - Pale Rider - Pancho - Raiden - Licoco - Setsugekka - Shishigane - Sinon - Sterben - Stinger - Subtilizer - Ten-Q - Uemaru - Usujio Tarako - Yamikaze - XeXeeD - XYZ
Death Gun Victims Garrett - Pale Rider - Usujio Tarako - XeXeeD
Squad Jam Participants KKHC Shirley
LPFM Fukaziroh - LLENN - M - Pitohui
MMTM Bold - David - Jake - Kenta - Lax - Summon
Narrow Dashin - Hidehide - Nagama - Nobu - Saika - Yasu
SHINC Anna - Eva - Rosa - Sophie - Tanya - Tohma
ZAT Benjamin - Casa - Frost - Koenig - Yamada - Let's Play Host
ZEMAL Heuy - Max - Peter - Shinohara - Tomtom
Others Clarence
Other main series characters Behemoth - Spiegel
AGGO manga original characters Batian - Boss - Costa - Lorosae - Panama - Rio
Non-Canon Afasys - Agil - Alice Zuberg - Argo - Asuna - Bazalt Joe - Daisy - Eiji - Eugeo - Itsuki - Klein - Kureha - Leafa - Lievre - Lisbeth - Philia - Premiere - Protagonist (Fatal Bullet) - Rain - Sachi - Seven - Silica - Strea - Yui - YUNA - Yuuki - Zeliska
Underworld Resident
Human Empire Rulid Village Algu - Alice Zuberg - Bercouli - Donetti - Doyke - Eugeo - Garitta - Gasupht Zuberg - Ivenda - Jaina - Jink - Kirito - Nigel Balbossa - Orick - Ridack - Sadina Zuberg - Selka Zuberg - Sister Azalia - Sulinea
Zakkaria Banou Wolde - Egome Zakkarite - Kelgam Zakkarite - Telin Wolde - Telulu Wolde - Toriza Wolde
Centoria Azurica - Cardinal - Quinella - Sadore - Yazen
Sword Mastery Academy Azurica - Eugeo - Frenica Szeski - Golgorosso Balto - Humbert Zizek - Kirito - Raios Antinous - Ronye Arabel - Sortiliena Serlut - Tiese Shtolienen - Volo Levantein - Zobun
Central Cathedral Ayuha Furia - Berche - Cardinal - Charlotte - Chudelkin - Elevating Operator - Fizel - Hainag - Hana - Linel - Quinella - Soness Furia - Xiao Choucas
Integrity Knight Alice Zuberg - Bercouli - Dakira - Deusolbert - Eldrie Woolsburg - Entokia - Eugeo - Fanatio - Fizel - Giro - Hobren - Jeis - Linel - Nergius - Renly - Scheta
Dragons Amayori - Himawari - Hinageshi - Hoshigami - Kazenui - Shimosaki - Takiguri - Tsukigake - Yoiyobi
Others Alderes Wesdarath V - Almera Woolsburg - Cruiga Norlangarth VI - Eolyne Herlentz - Eschdol Woolsburg - Hozaika Eastavarieth - Zeppos
Dark Territory Black Iums D.I.L - Dampe - Fu Za - Iskahn - K.U.V - Leazetta - Lengil Gira Scobo - Lipia Zancale - Vixur Ul Shasta - Yotte
Orcs Moricca - Renju - Rilpirin
Ogres Furgr
Giants Sigurosig
Goblins Aburi - Hagashi - Kosogi - Kubiri - Oroi - Shibori - Ugachi
Non-Canon Aleo - Cardo - Carver - Dorothy Isaiah Elisheva - Edith - Elcar Marscull - Fazahd - Hektor Ul Günther - Hersyrian - Jared - Kainan - Kayode Norlangarth - Kirimai - Lushe - Mary - Medieta - Medina Orthinanos - Momento - Paulie Aurimas - Phinea Suvale - Proxy - Rogu - Round Robin - Sarai - Shirley - Somelier - Sylvie - Tolgash Southacroith III - Vallenthor - Wegin Sorby - Zacza - Zappas - Ziczi
Underworld Visitors
Agil - Alicia Rue - Asuna - Eiji - Eugene - Gabriel Miller - Hirono Takashi - Jun - Kirito - Klein - Leafa - Lisbeth - Moonphase - Nori - Sakuya - Silica - Sinon - Siune - Tecchi - Vassago - YUNA
Non-Canon Argo - Ceba - Itsuki - Kureha - Mito - Philia - Premiere - Rain - ReoNa - Seven - Strea - Tia - Yui - Yuuki - Zeliska
Asuka Empire
Players Clevel - Koyomi - Merida - Nayuta - Ran - Yanagi - Yuuki
NPC Clovis (AI)
Staff Torao
Reality/Other Games
Rath Aki Natsuki - Higa Takeru - Hiraki - Ichiemom - Kikuoka Seijirou - Koujiro Rinko - Nakanishi - Niemom - Yanai
Others Alicia Klingerman - Cel - Clovis - Critter - Doctor Kurahashi - Eiji - Endou - Fujita Shin - Kirigaya Midori - Kirigaya Minetaka - Okano Kouji - Oosawa Mizue - Oosawa Sachie - Sada Akiyo - Satou Rei - Shigemura Tetsuhiro - Yuna - Yuuki Kouichirou - Yuuki Kyouko - Yuuki Shouzou
Non-Canon Es - Gattas - Genesis - Goliath - Kaede - Laraiah - Layla - Michael - PoH (Variant Showdown) - Premiere - Richter - Sigil - Teria - Tia
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