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Warning Spoiler Alert: This article or section contains details about plotlines not covered in the anime. Do not proceed unless you wish to be spoiled.

Sachi (サチ, Sachi?) was a supporting character in the Aincrad Arc. She was one of the 10,000 players who were trapped in «Sword Art Online» and a member of the Moonlit Black Cats guild. Along with the majority of her guild, Sachi was killed in the 27th Floor Labyrinth on June 22, 2023, after they ventured into a trap in a secret room inside the Labyrinth.

Background

In the real world, Sachi, along with all the other original members of the Moonlit Black Cats, were in a computer club at their school. She also happened to live fairly close to the leader of the guild, Keita.[5]

Appearance

Sword Art Online

Sachi's SAO Avatar Full Body

Sachi was a petite girl with shoulder-length black hair[5] and a small mole right under the corner of her right eye.[6] She wore a light blue tunic with a chestguard, a knee-length short skirt and grayish boots.[7] In battle, her weapon was a two-handed long spear.[5] Although she temporarily tried out wielding a sword and shield to help Tetsuo tank monsters, she eventually had to switch back to using a spear due to her fear of fighting monsters at close range.[5]

Personality

Sachi was a timid, apprehensive girl, who feared dying in Sword Art Online. Due to this fear, she had never intended to leave the Town of Beginnings and hated going into battles.[8] She only felt the peace of mind to sleep soundly when she discovered Kirito's true level, which made her feel safe in his presence.[8]

Chronology

Aincrad Arc

Red-Nosed Reindeer

While exploring a dungeon on April 8, 2023, Sachi and the other members of the Moonlit Black Cats encountered a large group of armed goblins that slowly forced them to retreat. As they only had one tank among them, the guild experienced severe difficulty in handling the monsters until they were assisted by a passing swordsman named Kirito. Once they defeated the goblins, the girl tearfully thanked their savior for rescuing her and the others, accepting his offer to escort them out of the dungeon. Afterwards, the Moonlit Black Cats guided Kirito to a tavern in Taft for a drink as thanks for his intervention. Upon hearing the solo player was only a few levels higher than them, the guild requested Kirito to join them and help Sachi convert from a spearwoman to a sword-and-shield user, to which the boy agreed.

Despite the Moonlit Black Cats leveling up at a rapid pace over the next few weeks thanks to Kirito's help, Sachi's fear in engaging monsters in close combat hampered her weapon usage conversion. Combined with unspoken pressure from everyone except the swordsman, this eventually culminated in the girl running away from the guild's temporary headquarters on the night of May 16, using an invisibility cloak to conceal herself in a waterway on Taft's outskirts. Surprised when Kirito located her, the girl confessed her terror of dying, wondering why she had to be trapped in Sword Art Online. Comforted by the boy's assurance that he would protect her until the game was cleared, the two returned to the inn, where they convinced the rest of the Moonlit Black Cats to discontinue her transition into a swordswoman. From that night onward, Sachi would come to sleep in Kirito's room, claiming she would be able to sleep peacefully if she remained in his presence while hearing him repeat his vow of protection.

During one of those nights sleeping in Kirito's room, Sachi awoke in his bed and saw the boy manipulating his status window, which revealed his level to be much higher than what he had led them to believe. Although the girl was unable to understand why the swordsman would conceal it from her and the others, she felt comforted and relieved that he was indeed strong enough to protect her. Suspecting Kirito would condemn himself if she did die regardless, which event she considered inevitable due to her nature, she used a crystal to record a message for Kirito, wherein she explained her thoughts and feelings on the matter. Imploring the swordsman to survive long enough to discover the meaning behind SAO's creation, as well as why someone as timid as her was brought into it and met him, she concluded the message with words of gratitude for being able to spent time with him, along with a rendition of "Rudolph the Red-Nosed Reindeer", since the lyrics gave her an impression of paternal reassurance like she received from Kirito. Then she stored the crystal in a shared inventory space with the boy and set it to activate around 07:00 on Christmas Day that year, intending to remove the crystal and personally relay her message if she managed to survive to Christmas Eve.

SAO E03d

Sachi's last words to Kirito.

About a month later on June 22,[1] while Keita was away negotiating the purchase of an official home for the guild, Sachi and the others decided to collect enough money for a celebration and to buy furniture for their new headquarters.[5] Just when they had acquired enough funds after an hour of hunting[5] in the 27th Floor[1] Labyrinth, Ducker discovered a treasure chest in an unexplored area of the dungeon.[9] Although Sachi shared Kirito's concern it might be too dangerous, they were ultimately unable to dissuade the thief from opening it,[9] which triggered a trap that sealed the room while summoning and spawning multiple monsters.[7] Unable to escape via teleportation crystals due to the trap's Anti-Crystal Zone, the panicked Moonlit Black Cats succumbed one by one to the enemies' sheer numbers, until only Kirito and Sachi remained.[9] Surrounded,[5] the girl reached for the boy just as one monster depleted the last of her hit points,[9] attempting to speak some final words to him[5] before dying at exactly 17:45:13.[1]

The Day After

On June 22, 2025, at 5:45:13 PM, exactly two years after Sachi's death, her emotions preserved by the Cardinal System temporarily interfered with Asuna's avatar in ALfheim Online. The former vice commander of the Knights of the Blood experienced a vision, in which she witnessed an image of Sachi slowly and lovingly singing Rudolph the Red-Nosed Reindeer. After finishing the song, the apparition turned to Asuna and requested her to tell Kirito for her that she was happy, before the vision ended.

Non-canon Chronology

NonCanonAlert Non Canon: Some or all events and details given in this section, may be considered non-canon to the main story.


Hollow Fragment

A Hollow version of Sachi was encountered by Kirito while he was exploring a dungeon in the Alevaste Otherworld section of the Hollow Area. Despite being unable to recognize the swordsman, the girl had a vague recollection of having met him before and thus felt oddly comforted by his presence. When the boy expressed interest in her being within such a dangerous place, Sachi explained that she was certain about having an important task to accomplish, despite being unable to recall what it was, and thus she refused to leave the room until she could remember it. When Kirito acquiesced to her resolve and instead offered to stay with her for a while longer, the girl declined as she sensed that the boy had other business to handle, but she promised to wait for him until he was finished with it.

Upon Kirito's return, Sachi learnt about his relationship with her and the Moonlit Black Cats. Although she herself could not remember the details of his story, she did recall that her current goal was to fight monsters in the Driogeer Skycaves. With Sachi agreeing to have Kirito accompany her due to his concerns about her safety, the pair traveled to the girl's destination, where they found a secret door to a hidden chamber. Once they entered the room, the door closed behind them, forcing the duo to fight multiple high-level monsters that immediately spawned in front of them. After the battle, the girl admitted to being aware that she was only a copy of a deceased player; nevertheless, she thanked Kirito for helping her fight despite her fears, explaining that the real Sachi felt the same way. In the end, Sachi promised to accompany Kirito if he ever wished to adventure with her in the Hollow Area.

Fatal Bullet

The Diva of the Snow Fields

Shortly after the events of the Death Gun incident and the case of stolen NerveGear units, a Non-Player Character (NPC) version of Sachi was created based on her leftover data. This NPC was unexpectedly encountered by Afasys, Asuna, Eiji, Kirito, the Protagonist, Sinon, Yui, and Zeliska, while they were searching for a particular person deep inside a dungeon within the White Frontier. Due to a mysterious growing anomaly in her NPC coding, Sachi failed to recognize Kirito and gradually became unresponsive as a result of her Artificial Intelligence (AI) functionality apparently being consumed. Despite her condition, she passively accompanied the others as they attempted to halt the process, which eventually resulted in her fully regaining her memories once they defeated a quest boss responsible for her deterioration.

However, Sachi's recovery also allowed the system to detect that the original Sachi had died in Sword Art Online, which prompted it to begin erasing the data for her avatar. As the quest reward item the Protagonist had received from defeating the boss allowed saving character data, the girl decided to record her player data on the item as a memento for Kirito to remember her and alleviate his despair over losing her again, before her avatar dispersed into fragments of light.

Several days later, Sachi's character data was implanted into a blank ArFA-Sys unit by a recently-recovered Lievre. Once the unit was activated, the girl was able to accompany Kirito and the Protagonist on their adventures.

Gallery

See: Sachi/Image Gallery

Trivia

  • In the light novel, Sachi and Kirito had a shared inventory page separate from their individual inventory, which either one could access at anytime, mainly used to put common items such as potions and crystals for their convenience. The creation of this slot was requested by Sachi under the guise of being able to share potions between them, even though the guild inventory could be used for this purpose. The real reason why she wanted this slot was to be able to leave a comforting goodbye message to Kirito, in case she died before Christmas.
  • Sachi's death was one of the driving factors for Kirito's refusal to join another guild, and re-embracing the path of a solo player, until over a year later, when he was comforted by Asuna and joined the Knights of the Blood.
  • In the Blu-ray/DVD package volume 2, the character song CD featured Sachi (Hayami Saori) singing "Memory Heart Message" as the 2nd Character Song for this series. This CD is bundled along with the 3rd Character Song, which is sung by Silica (Rina Hidaka).
  • In the web novel, Sachi was Kirito's first love prior to Asuna.[10] In addition to this, Kirito's and Sachi's relationship was depicted as being more intimate, and close in the web novel version of the story. However, subtle changes in the text of the published version imply that Kirito and Sachi were not as close as in the web novel.
  • In Sword Art Online: Infinity Moment, Kirito's inventory contains items from Sachi (and Asuna) separate from other items. The shared inventory contains a message record crystal that can only be activated in Kirito's room.
  • In Accel World x Sword Art Online: Millennium Twilight, a dummy account of Sachi is available as a playable DLC character from the Launch Edition.

Notes

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

References

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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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