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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.

Moon Cradle (ムーン・クレイドル, Mūn Kureidoru?) is the 19th book in the Sword Art Online light novel series, published on February 10, 2017. It is a side story that takes place before the end of the Alicization Arc.

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Some time after the War of Underworld, Underworld entered a state of peace. The people of the Human Empire and the Dark Territory, the Goblins, Orcs, Ogres, and Giants all signed a peace treaty and the Dark Territory and the Human Empire opened up for trade and travel. After the Rebellion of the Four Empires, the four Imperial Noble Families, together with the entire noble system, had been overthrown. The Underworld Fundamental Law was introduced and the Taboo Index revised. The Integrity Knights were becoming the largest fighting force in all of Underworld. Ronye and Tiese became Integrity Knight Apprentices, along with their dragons Tsukigake and Shimosaki.

Kirito became the Representative Swordsman and de facto leader of the Human Empire Unity Council. He engrossed himself in the research and examination of his new creation, the «Mechanical Dragon». After a failed public experiment, Kirito revealed to Ronye that the «Mechanical Dragon» research was currently his highest priority as it was very likely for the imbalanced resource distribution between Human Empire and Dark Territory to cause another war. If the invention of the «Mechanical Dragon» would be successful, it might be able to cross the Mountain Range at the Edge, allowing the races of the Dark Territory real countries to live in, as their current territories were just stretch of barren land.

On the 18th day of the 2nd month of the Human Empire Calendar 382, a Centoria resident was killed, with a goblin visitor suspected to be the murderer. All visitors were required to agree on a set of rules before they were allowed to enter the Human Empire, which included a ban on murder. As the suspect's right eye still remained intact, indicating that the goblin did not violate the Seal on the Right Eye, Kirito and other members of the Council concluded that the goblin did not violate the rule and thus had not killed the Centoria resident. With no other suspects being identified and no apparent cause that could lead to killing of that Centoria resident was unveiled, Kirito and other members of the councils worried about the possibility that unidentified rebellion forces or Dark Sorceresses were behind the case to plot another great war. Kirito decided to head to Obsidia, the Dark Territory's Capital to meet with Iskahn, the leader of the Dark Territory Inter-racial Council, to reach an agreement as soon as possible.

But as Obsidia is more than 3000 km away from Centoria, it would take 3 days for dragons and a month for to complete the trip. Kirito decided to use the second Mechanical Dragon to fly to Obsidia since the situation was pressing and the Integrity Knights were too busy to help. But as Ronye was worried about the safety and the possibility that the event was setup as a trap to attempt assassinate Kirito, Ronye nominated herself to be a guard for Kirito.

Afterwards, Ronye met Asuna, who then led Ronye to the weaponry to take a sword to guard Kirito. While Ronye was choosing a sword from several swords that was presented to her, she recalled Eugeo's description on the relationship between a swordsman and his sword, which was summarized as love toward sword. As Ronye mindlessly extended her hand, a sword with handle as black as Kirito's hair and soft silvery gloos pommel and ring caught Ronye's hand. After then, Asuna asked Ronye to take care of Kirito and told her to flee when Kirito told her to do so, and told her that she can't go with Kirito as she must remain to resolve dissatisfaction against the Human Empire Unity Council.

After giving her original sword to Asuna to be returned to Human Army, Ronye head to her own room and decided to take a bath at 90th Floor of Central Cathedral before the next day's long trip. In the bath, Ronye met Fizel, who had been bestowed as an official Integrity Knight. Then Fizel warned Ronye about the danger of Dark Territory as Dark Territory was still under Rule of Force and does not have Fundamental law and Taboo Index.


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Aincrad Arc Fairy Dance Arc Extra Edition Phantom Bullet Arc Calibur Mother's Rosario Ordinal Scale Alicization Arc Unital Ring Arc
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Light Novels Main Series Volume 01 - Volume 02 - Volume 03 - Volume 04 - Volume 05 - Volume 06 - Volume 07 - Volume 08 - Volume 09 - Volume 10 - Volume 11 - Volume 12 - Volume 13 - Volume 14 - Volume 15 - Volume 16 - Volume 17 - Volume 18 - Volume 19 - Volume 20 - Volume 21 - Volume 22 - Volume 23 - Volume 24 - Volume 25 - Volume 26 - Volume 27
Progressive Series Progressive 01 - Progressive 02 - Progressive 03 - Progressive 04 - Progressive 05 - Progressive 06 - Progressive 07 - Progressive 08
Alternative Series GGO 01 - GGO 02 - GGO 03 - GGO 04 - GGO 05 - GGO 06 - GGO 07 - GGO 08 - GGO 09 - GGO 10
Clover's Regret Volume 1 - Clover's Regret Volume 2 - Clover's Regret Volume 3
Material Edition Volume 01 - Volume 02 - Volume 03 - Volume 04 - Volume 05 - Volume 06 - Volume 07 - Volume 08 - Volume 09 - Volume 10 - Volume 11 - Volume 12 - Volume 13 - Volume 14 - Volume 15 - Volume 16 - Volume 17 - Volume 18 - Volume 19 - Volume 20 - Volume 21 - Volume 22 - Volume 23 - Volume 24 - Volume 25 - Volume 26 - Volume 27 - Volume 28 - Volume 29
Character Edition Lisbeth Edition - Silica Edition - Pina Edition
BD/DVD Specials Main Series Cordial Chords (OS BD/DVD) - Distant Journey (Alicization BD/DVD Vol.1) - If We Could Walk Together (Alicization WoU BD/DVD Vol.8) - If You Were Here (Alicization BD/DVD Vol.8) - If You Wish It (Alicization WoU BD/DVD Vol.2) - Rainbow Bridge (Extra Edition BD/DVD) - Sugary Days (Season 2 BD/DVD Vol.5) - Sisters' Prayer (Season 2 BD/DVD Vol.9) - The Day After (Season 1 BD/DVD Vol.9) - The Day Before (Season 1 BD/DVD Vol.1)
Alternative Series How LLENN Stopped Fretting and had Her Fire for Combat Sparked by Pitohui (AGGO BD/DVD Vol.6)
Magazine Publications Calibur SS - Celeste Fairy - Objectors! ~VRMMO Development Tragedy~ - Open-Air Bath - Salvia and the MTB
Crossover Dream Game -Crossover- - Versus - Versus II
Dengeki Fair Main Series 16.8.5 (2014) - Agil and Klein's Exciting Meal - Breaking the Damage Limit (2012) - Bluish Memories (2021) - Defensive Power (2015) - SAOP 4.1 (2016) - Summer Memories (2019) - The End of the Summer and the Straw Hat (2018)
Alternative Series LLENN and Fukaziroh Talking About Dates (2016) - Mizugi de Tatakaeru ka Online (MTO) (2018)
Other Specials Main Series chromatic colors (abec Art Works) - Cooking with the Wife (SAO x NewDays collaboration) - Hopeful Chant (Ordinal Scale screenings) - prismatic colors (abec Art Works Wanderers)
Alternative Series (AGGO) Girl Meets Gun ~P90 ni tsuite Yoku wakaru Online (PYO)~ (P-90 Airsoft Gun bonus) - Her step, step (ReoNa's Prologue Album) - Minami no Island Online (MIO) (Dengeki Island!) - MZO (Dengeki Splash) - Pitohui, Elsa, and a Fine Day for Handguns (AM.45 Airsoft Gun) - Sugoimizugi Jam (Dengeki Girls Swim Wear Festival) - The Untold Tale of the Vorpal Bunny's Birth ~Otherwise Known as the Worries of Two Gun Nuts~ (Vorpal Bunny Airsoft Gun bonus)
Alternative Series (Clover's Regret) Idle Talk - The Shinobi's Reckless Remarks (Dengeki Bunko Magazine Animate bonus) - The Story of the Matchmaking Bakeneko (Clover's Regret Vol.1 Animate bonus) - The Strange Tale of Makuwa Melons (Clover's Regret Vol.1 Melonbooks bonus)
Web Stories There is But One Ultimate Way
Manga Aincrad Volume 01 - Volume 02
Fairy Dance Volume 01 - Volume 02 - Volume 03
Phantom Bullet Volume 01 - Volume 02 - Volume 03
Mother's Rosario Volume 01 - Volume 02 - Volume 03
Calibur Tankoubon
Alicization Volume 01 - Volume 02 - Volume 03 - Volume 04 - Volume 05
Progressive Volume 01 - Volume 02 - Volume 03 - Volume 04 - Volume 05 - Volume 06 - Volume 07
Progressive - Barcarolle of Froth Volume 01 - Volume 02
Progressive - Scherzo of Deep Night Volume 01 - Volume 02
Girls Ops Volume 01 - Volume 02 - Volume 03 - Volume 04 - Volume 05 - Volume 06 - Volume 07 - Volume 08
Ordinal Scale Volume 01 - Volume 02 - Volume 03 - Volume 04 - Volume 05
Kiss and Fly Volume 01
4koma Manga Volume 01 - Volume 02 - Volume 03
SAOAGGO Manga Volume 01 - Volume 02 - Volume 03
Comic Anthology Volume 01 - Volume 02
4koma Anthology Volume 01 - Volume 02 - Volume 03
Hollow Realization Volume 01 - Volume 02 - Volume 03 - Volume 04 - Volume 05
Alicization Lycoris Volume 01 - Volume 02 - Volume 03
Aincrad Night of Kirito Tankoubon
Kirito's Gun Gale Wars Tankoubon
Anime Season I - Aincrad Arc Episode 01 - Episode 02 - Episode 03 - Episode 04 - Episode 05 - Episode 06 - Episode 07 - Episode 08 - Episode 09 - Episode 10 - Episode 11 - Episode 12 - Episode 13 - Episode 14
Season I - Fairy Dance Arc Episode 15 - Episode 16 - Episode 17 - Episode 18 - Episode 19 - Episode 20 - Episode 21 - Episode 22 - Episode 23 - Episode 24 - Episode 25
Season I - Special Episodes Sword Art Online Extra Edition
Season II - Phantom Bullet Arc Episode 01 - Episode 02 - Episode 03 - Episode 04 - Episode 05 - Episode 06 - Episode 07 - Episode 08 - Episode 09 - Episode 10 - Episode 11 - Episode 12 - Episode 13 - Episode 14 - Episode 14.5
Season II - Calibur Arc Episode 15 - Episode 16 - Episode 17
Season II - Mother's Rosario Arc Episode 18 - Episode 19 - Episode 20 - Episode 21 - Episode 22 - Episode 23 - Episode 24
Movie Sword Art Online The Movie -Ordinal Scale-
AGGO Episode 01 - Episode 02 - Episode 03 - Episode 04 - Episode 05 - Episode 06 - Episode 07 - Episode 08 - Episode 09 - Episode 10 - Episode 11 - Episode 12
Season III - Alicization Arc Episode 01 - Episode 02 - Episode 03 - Episode 04 - Episode 05 - Episode 06 - Episode 07 - Episode 08 - Episode 09 - Episode 10 - Episode 11 - Episode 12 - Episode 13 - Episode 14 - Episode 15 - Episode 16 - Episode 17 - Episode 18 - Episode 18.5 - Episode 19 - Episode 20 - Episode 21 - Episode 22 - Episode 23 - Episode 24 - Episode 25 - Episode 26 - Episode 27 - Episode 28 - Episode 29 - Episode 30 - Episode 31 - Episode 32 - Episode 33 - Episode 34 - Episode 35 - Episode 36 - Episode 37 - Episode 38 - Episode 39 - Episode 40 - Episode 41 - Episode 42 - Episode 43 - Episode 44 - Episode 45 - Episode 46 - Episode 47
Sword Art Offline Episode 01 - Episode 02 - Episode 03 - Episode 04 - Episode 05 - Episode 06 - Episode 07 - Episode 08 - Episode 09 - Extra Edition
Two Episode 01 - Two Episode 02 - Two Episode 03 - Two Episode 04 - Two Episode 05 - Two Episode 06 - Two Episode 07 - Two Episode 08 - Two Episode 09
Ordinal Scale
Drama CD Accel World + Sword Art Online Drama CD Ordeals of Kirito
Ichiban Kuji STAGE2
Ichiban Kuji STAGE3 Melodies Go Beyond the Forgetting Curve... - The Grand Plan for a Summer Festival Performance! - The Grand Plan to Overcoming Picky-Eating! - When Asuna and Yuuki Changed into Swimsuits
Ichiban Kuji Ordinal Scale A Brief Instant of Reminiscing Right Below the Concert - From Asuna's Diary on a Certain Day in Late April
SAO x KYOTO NIPPON FESTIVAL The Great Barrier of the Old Capital of Kyoto
Lycoris Drama CD Another Heroine Inverter
Sword Art Online Art Book and Guide Book Main Page
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