Kirigaya Kazuto/Relationships

Asuna
Asuna is Kirito's partner and main love interest in the series. Among all the people Kirito met, she is the closest and dearest to him. Originally the two of them only think of clearing the game, but their relationship begins when they partied in the 1st floor. During the boss fight in the 1st floor, he called Asuna by her name for the first time (due to noticing her character name below the HP gauge). She is also one of the two people knowing the reason why Kirito became a Beater (the other was Agil). When the two of them partied again in the 74th floor, Asuna normally cooks for Kirito. As the series progresses, the two of them fall in love with each other. After the two of them declared their love for each other, they were so attached to each other and only concern of their safety. Their relationship is very serious to the point that they cannot live on if one of them dies. An example is shown when Kirito asks Asuna not to take part in the boss fight in the 75th floor to which she replies if he did not return, she will commit suicide thus joining him in the fight saying she will protect him. This also led to the two characters getting married in-game where they resided in the 22nd floor for two weeks as their honeymoon until being called back to the frontlines. Kirito also does not give concern to his safety when it comes to rescuing Asuna like when he tries to fly up the World Tree uncaring whether he falls and his avatar dies or not. After rescuing Asuna in ALO, the two of them finally meet face to face and they officially became a couple in the real world. Kirito tends to take things on to himself when it concerns Asuna as shown in the GGO incident where he didn't tell Asuna that he could very well die (due to the theories they held about the incident at the time) and took part in the mission in secret since he didn't want to risk her safety. Asuna eventually finds out the details on her own and rushes to Kirito's side, holding his hand as he is fighting in GGO. Kirito said that it was her warmth that gave him the strength to win.

Klein
Klein is Kirito's first friend, before meeting Asuna. He became Kirito's friend after he asked Kirito to teach him to play SAO. Klein was one of the few people that Kirito considered as a "friend". Klein really cares for his friends and keep them all alive, which Kirito greatly respects. Klein tends to worry about Kirito since he knows his loner nature telling Asuna to "take care of him" and that he "isn't a bad guy" to which she replies she will and she has long since known respectively. Klein is also responisble for giving Kirito extra strength when he broke down after learning he couldn't revive the dead (Sachi). He regularly meets with Kirito and his friends and occasionally go with them in quests in ALO, especially after the release of the World Seed. One such instance includes the quest for Excalibur.

Agil
Agil is an axe wielding merchant who has a good relationship with Kirito. He is one of the two people knowing the reason why Kirito became a Beater (the other was Asuna). Like Klein and Asuna, he also respects Kirito, and is always offering any help he can when Kirito needs it (like sheltering him when Kirito became famous after his Dual Blades became known, or implementing the "Seed" that Kayaba gave Kirito) Outside of SAO he is married and the owner of the Dicey Cafe where Kirito and his friends often meet up.

Silica
Silica is a player that Kirito met when he was wandering around in the 35th floor. When Silica asked him why is he being kind to her, he gave her a "manga-like" answer that she resembles his "sister". As they journey together, Silica begins to develop feelings for Kirito. After reviving Pina, she realizes that she can't follow Kirito to the Frontlines due to her lower level tho she still is happy to be able to meet him and they keep in touch by adding each other as friends, something Asuna later noted as rare due to Kirito being a anti social solo. After the ALO incident she goes to school with Kirito, Asuna and Lisbeth. Both Silica and Lisbeth are in agreement to give both Kirito and Asuna space for one month before they make their individual moves on him. Though after seeing how close Asuna has gotten to Kirito (made him lunch at the time) they quickly regret their "pact".

Lisbeth
Lisbeth is a close friend of Asuna who recommended her to Kirito. He accompanied her in the quest for the special ore required for the job. During the quest, she also develops feelings for Kirito without him noticing. After the quest, she becomes Kirito's personal blacksmith. She is devastated when she finds out that Kirito is Asuna's crush. But finds solace when Kirito tells her about the "Black Cats" and that for the first time after losing his guild he had felt natural while partying with her. Despite intially giving Kirito to Asuna when the game is cleared she knows right away that Kirito is the one who did it and among all the cheers she shouts out at the top of her lungs that she loves Kirito and that she swears they will meet up in the Real world. Right after they meet in the real world, she becomes a regular player in ALO and frequently takes on quests with Kirito and his friends and takes up tasks of upgrading their equipment. She also goes to school with Kirito, Asuna and Silica.

Sachi
Sachi is a member of the guild Black Cats of the Full Moon who Kirito befriended. They became very close to the point of sleeping together in the same room; their relationship described as "two stray cats licking each others' wounds" as they comforted each other. Their relationship was close enough that they had a shared page in each others' inventory (similar, but not quite at the level of married players who had combined inventories). Kirito promised her that she would not die, though unfortunately, he would not be able to keep his word. Even after her last message gave him the strength to live, he still never fully was able to escape his guilt until he married Asuna.

Yui
Yui is Kirito and Asuna's in-game daughter who is an «AI». While Kirito loves Asuna as his fiancé/wife, Kirito loves Yui as his own daughter and Yui in turn thinks of Kirito and Asuna as her parents. In the real world, Kirito uses his skills and resources to make a device for Yui to view the real world even whilst she is in virtual reality and gives her the ability to communicate with them. Yui is probably Kirito's second most beloved person while Asuna is the first. In ALO she takes the form of a navigation fairy who is always seen on either Kirito or Asuna's shoulder. Yui tends to misunderstand why humans aren't direct in expressing their feelings saying if she was the one who did it then she would simply be forward about it (she then kisses Kirito). She also gets annoyed when any girl other than Asuna or Lyfa interact with her "Papa".