Nao

Biodata

Feature	Value
Name	Nao Kirigaya (直叶) 1
Alias(es)	Terraria (while disguised as one of Underworld's founding goddesses) 849
Gender	Female 1
Affiliation	Wenren family kendo dojo; Kirigaya family 1 3
Occupation/Role	Kendo practitioner; Seiya Wenren's childhood friend and caretaker; player of Shangri-La Frontier 1 85 602
First Appearance	Chapter 1 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Lifelong kendo trainee	1	Continued training after Kazuto quit kendo; idolized Seiya and aspired to his swordsmanship.
Intensified practical kendo training	298	Her daily training since elementary school, motivated by admiration for Seiya, leaves her far stronger than an ordinary high-school student.
Real-world combatant	298	Defeats Atsushi Kanemoto with a bamboo-sword thrust and subdues Kyoji Shinkawa during the Death Gun home invasion.
Shangri-La Frontier player	602 608	Obtains the game to spend time with Seiya and resolves to improve enough not to hold Seiya or Kirito back.
Underworld goddess disguise	849	Appears as Terraria alongside the other founding goddesses and openly addresses Kirito as her brother.

Background / History

Nao and Kazuto Kirigaya grew up alongside Seiya Wenren as his childhood friends and attended the Wenren family dojo. While Kazuto abandoned kendo at age seven, Nao continued practicing; Seiya's national championship and mastery of the Wenren Sword Style made him her idol. She hoped he would eventually inherit and reopen the closed dojo. 1

When Seiya bought NERvGear to enter Sword Art Online, Nao initially disliked gaming because it seemed likely to take time away from their kendo practice. She changed her view after learning that SAO's sword-focused full-dive environment could sharpen Seiya's reflexes and awareness, and she became interested in playing herself. 3

After Seiya awakened from his two-year coma, Nao cared for him and cooked porridge for him. Their closeness became more openly romantic when she admitted that she had cared for him because she had feelings for him. 85 262

Personality

Nao is deeply devoted to Seiya, combining admiration, protectiveness, and romantic jealousy. She is willing to take initiative to remain close to him, including joining Shangri-La Frontier, monitoring his meetings with female game friends, and joining forces with Asuna when she suspects another woman is pursuing him. 602 627 647

Her concern can make her impulsive: she mistakes Asuna for Death Gun and rushes to confront her, later claims to be Seiya's MMO girlfriend, and becomes suspicious whenever Seiya leaves to meet unnamed “friends.” 281 283 645

Despite her embarrassment around Seiya, Nao is resolute under pressure. During the Death Gun incident, she faces armed intruders with a bamboo sword rather than retreating. 85 298

Abilities & Skills

Kendo

Nao has trained in kendo since elementary school and practices diligently because of her admiration for Seiya. Her ability is far beyond what her age and appearance suggest. 298

• Uses a bamboo sword effectively in real combat. 298
• Employs fast lunging footwork and a powerful thrust; her strike knocks Atsushi Kanemoto unconscious. 298
• Subdues Kyoji Shinkawa without needing to fight him after intimidating him with her skill. 298
• Is confident enough to volunteer to protect Seiya during the planned confrontation with Death Gun. 280

Virtual-Reality Gaming

Nao begins playing Shangri-La Frontier specifically to spend more time with Seiya and become capable of supporting him rather than slowing him down. 602 608

• Obtains the game from Kirito after it sells out elsewhere. 602
• Uses the character ID “Brother Seiya is Number One.” 622
• Seeks Seiya's guidance after entering the game, though he initially cannot accompany her because of a prior engagement. 622
• Later explores multiple areas with Seiya and Asuna after the Gravekeeper Vezavimon conquest. 645
• Is considered stronger than Kirito expects, and refuses to assist him against a Unique Monster after he underestimates her. 600

Terraria Disguise

Nao appears as Terraria, one of the three founding goddesses of the Human Empire, during the Underworld conflict. 849

• Calls Kirito “brother” in front of Chudelkin, exposing her familial connection to him. 849
• Her casual behavior undermines Chudelkin's attempt to turn the goddesses against Seiya. 849

Equipment / Weapons / Items

• Bamboo sword — Used to defeat Kanemoto and intimidate Kyoji during the Death Gun home invasion. 298
• Shangri-La Frontier game copy — Received from Kirito after the game had sold out at many retailers. 602

Relationships

• Seiya Wenren — Childhood friend, kendo idol, and the person she openly loves; she cared for him after his coma and wants to remain by his side in both reality and virtual worlds. 1 262 602
• Kazuto “Kirito” Kirigaya — Older brother. Their relationship includes sibling bickering, but he provides her with Shangri-La Frontier and later supports her pursuit of Seiya. 1 602
• Asuna — Initially mistaken by Nao for Death Gun and treated as a rival for Seiya's affection; they later cooperate to investigate Seiya's female gaming partners and compete against Silvia in Shangri-La Frontier. 281 627 787
• Anji — Housemate and protective older-sister figure. Anji fears for Nao during the Death Gun incident, while Nao appreciates her courage and support. 275 298
• Atsushi Kanemoto — Death Gun accomplice defeated by Nao during a home invasion. 298
• Kyoji Shinkawa — Death Gun accomplice whom Nao subdues after Kanemoto's defeat. 298
• Alice and Lybia — Their presence at Seiya's home makes Nao feel threatened, though they later offer to take her shopping to escape visiting VIPs. 865

Story Role / Major Arcs

Early Kendo and SAO Period

• Remains one of Seiya's closest childhood friends and views him as the ideal inheritor of the Wenren dojo. 1
• Brings homemade cakes to Seiya's dojo and shows concern for him and his family. 2
• Initially objects to Seiya's NERvGear purchase, then supports his SAO participation once she understands its potential value for sword training. 3

Seiya's Return and the Death Gun Incident

• Cares for Seiya after he wakes from his two-year coma and later confesses that her care stems from her feelings for him. 85 262
• Moves in with Anji after securing a promise that Anji will not pursue Seiya. 275
• Mistakes Asuna for Death Gun and confronts her to protect Seiya, creating a tense first meeting between the two girls. 281 283
• Defends the house against Kanemoto and Kyoji, decisively ending the immediate home-invasion threat before authorities arrive. 298 299
• Resolves to actively pursue Seiya after becoming jealous of his relationship with Asuna. 304

*Shangri-La Frontier* Arc

• Joins Shangri-La Frontier to spend more time with Seiya and prove she can be useful in-game. 602 608
• Becomes frustrated when Seiya declines her invitation because he already has plans with Kirito. 622
• Grows suspicious of Seiya's new female game partners, particularly Amane Towa, and enlists Asuna to investigate. 626 627
• Follows Seiya to the airport when he leaves to meet a game friend, believing he may be meeting a woman at a hotel. 646 647
• Continues to compete with other women for Seiya's attention, forming an alliance with Asuna against Silvia. 787

Underworld Arc

• Takes on the appearance of Terraria during the arrival of the three founding goddesses, revealing her connection to Kirito through her informal address. 849
• Feels insecure when Alice and Lybia begin staying at Seiya's home following Underworld's exposure to the wider world. 865

Trivia

• Nao's Shangri-La Frontier character ID, “Brother Seiya is Number One,” directly reflects her longstanding admiration for Seiya. 622
• Her “salted fish thrust” is the bamboo-sword attack that knocks Kanemoto unconscious. 298
• She and Asuna shift repeatedly between romantic rivals and reluctant allies when other women approach Seiya. 627 787