Yukino's father is a member of Chiba prefectural diet. Yukino's father is also the CEO of a construction company. Her father seems to be more lenient than her mother as he lets Yukino live alone in an apartment. It was mentioned by Haruno in Episode 3 of season 2 (adapted from Volume 8 Chapter 3 ) that Yukino sent a souvenir by courier to their house which Haruno explains that Yukino resents them but doesn't want to be hated.
Voiced : Kikuko Inoue
Her mother was introduced in Episode 10 of season 2 (adaptation of Light novel of Volume 10 Chapter 2), where she came to take her daughter and Hayato to their traditional new year feast. Haruno first mentions her mother in Episode 9 of Season 1 ( adaptaton of Volume 5 Chapter 6) as scarier than herself and takes all decision of the family, enforces the others to follow while the rest have no choice but to compromise with her decision and follow.
Yukino is mentioned to not be in good terms with her mother by Haruno or compromising with her mother's wishes. It was also mentioned by Haruno that her mother was against Yukino's idea of living on her own. The strain in the relationship is clearly shown in the anime.
Later, In Episode 11 of Season 2 (adaptation of Volume 11), she came to visit Yukino to her apartment but had to wait in the limo since Yukino was taking her time to get there from the community center where she expressed her concern for Yukino being late and also expressed her grief of Yukino's career choice which she heared from Haruno, She later blames herself for letting things get this far. When Yui tried to defend Yukino, Mrs.Yukinoshita indirectly asked them not to interfere and leave to their home . Her eyes met Hachiman who excused himself. Yukino promises to explain herself and asked her mother to leave.When her car passed by Hachiman and Yui while they are going home, Hachiman felt that Mrs. Yukinoshita was observing him through the one way vision window of the rear seat of the car which sends a chill through his spine.
She is the older sister of Yukino. Haruno is known to be more outstanding than her sister, and Yukino holds strong animosity towards her. Similar to Hachiman's sister Komachi, Haruno seems to like pairing up Hachiman and Yukino together, but her efforts are more persistent as she even going to an extent of scaring Yui to stay away from Hachiman or get her to call him big sister.
In Episode 9 of season 2, it is later revealed that most of Yukino's fearful and unsociable behavior are due to her sister's meddlesome behavior towards her. Whatever Haruno sees cute in Yukino is the same thing that she hates about her. When Yukino questions Haruno about Hayato's career path choice, Haruno answers coldly with a smile to find it herself. It was revealed that Yukino stopped giving valentine chocolates to Haruno after not receiving any from Haruno
In Episode 11 of season 2, Haruno came to stay with Yukino in her apartment by her mother's order.
Soubu High School
Hachiman nicknames Yukino "Ice-cold Beauty" for her personality from the start. Yukino hates how Hachiman accepts and affirms weakness by loyalty to status quo. While Yukino does not recognize Hachiman as a friend, she acknowledges him as an acquaintance. It is revealed that Yukino was in the car that struck Hachiman which left him hospitalized and set him on the path of being a loner. When they formally meet, Yukino recognized Hachiman from the car accident but hid this fact from him when Hachiman joined the service club, pretending not to know him while he was aware of who she is but not her knowledge of the accident. However, when she learned that he was hospitalized from the accident it caused her to feel silently guilty after hearing what occurred.While the two are hostile at first, they are shown to have similarities as they are both loners who are ostracized by their peers and distant as a result. After learning from her sister that she was there at the day of the incident, Hachiman slowly distances himself from Yukino even though she had tried to explain herself after realizing he became aware. Following this, she is shown to be somewhat sad about it, possibly meaning she was getting use to their interactions.
Over the course of the series, the two seem to rebuild their relationship and the standing between the two seems to soften slowly. Yukino starts to warm up to Hachiman and even manages to eventually smile at him, showing her girly side to him. She is also fond of teasing Hachiman by "blaming" him to be the cause of some incident. For example, she claimed that her sleepiness vanished after seeing Hachiman's face, and Saki Kawasaki's change of behavior started after she became a classmate of Hachiman etc, much to his irritation.
Although she still does not recognize him as a friend, she starts to see Hachiman for who he is and has somewhat started to develop a possible crush on him but this is somehow restrained as in the novel, it is strongly hinted that she realizes about Yui's feelings toward Hachiman.
Hachiman and Yukino along with Komachi went out shopping for Yuighama's birthday in which Komachi slid away creating a date-like situation. Sensing the suspicion of the shop assistant and the surrounding customers, Yukino asked Hachiman to pretend to be her boyfriend to his confusion. In Chapter 4 of Volume 3, Hachiman won a Pan-san stuffed toy for Yukino from a crane game using his underhanded technique.
It appears Episode 8 of season 2 (Adaptation from Chapter 6 of Volume 9 of the Light novel) how much of Yukino's icy behavior is melting. She was about to burst into tears when Hachiman came for a request in helping Isshiki and said that he wanted "something genuine" (implying relationships and feelings). For the first time in her life, Yukino feels very emotional. It is hinted that she has started to lose her "ice queen" personality especially to Hachiman but only when they are alone. She smiles and chuckles often in their conversation lately.
In Episode 9 of season 2 (Adapted from Volume 9 of light novel), in Destiny Land, both Yukino and Hachiman got separated from the group due to the crowd and went on a ride together, where she asked Hachiman to save her someday without any other words in succession. There she opened up a little about her past to Hachiman and said she wants something that both her sister and Hachiman don't.
In Episode 10 of season 2 (adapted from Volume 10), Hachiman bought PC glasses for her birthday to which Yukino nervously waits for Hachiman to compliment hew on how the specs look on her. This is rather unusual, since she normally thanks any compliment in the past like her apron purchase in time of Yui's birthday shopping and also at the time of her maid outfit in Saki's case. This makes Yui worried swifting her glance between Yukino and Hachiman. When Hachiman volunteered to carry Iroha's belongings, both Yui and Yukino stayed silent. This vaguely hints that they were jealous.
In Episode 11 of season 2, Yukino is shown to treat the wounds of Hachiman in the infirmary which resulted during the marathon. During the treatment, they had a long time staring at each other flustered. This was abruptly stopped by Hachiman thanking her. This was also when Hachiman asked her about her career path to which she was surprised to hear. She says that she'll be taking liberal arts. During a meet-up between Haciman and Haruno, Haruno asks if Yukino told him of her career plan to which he said yes. Haruno indicates that Yukino trusts him but he denied it by saying it's not trust. Haruno implies that it is indeed not trust but something more cruel.
In Episode 12 of season 2, Service Club gets a request from Yumiko, Saki, Ebina and Iroha regarding having problems making or giving valentine chocolate, for which Hachiman suggests to make it like a event. They later held Pre-Valentine Cooking class where Haruno, Service Club members and others are invited. When Kaori asks Hachiman whether she gave chocolate to him before, everyone is surprised and he tells her she did not.
When she replies saying "I'll give you some this year", this comment clearly makes Yukino and Yui jealous.
Next, Haruno says directing towards Hayato that he received chocolates from Yukino long time back, much to Yumiko and others surprise. For a second Hachiman flinches and instantly restores his composure when Yukino searches for any reaction given by Hachiman on Haruno's statement. Hayato covers Haruno's statement by saying Yukino gave it before starting of grade school to both Hayato and Haruno which Haruno did not refuse.
When the event was near the end, Hachiman tastes the chocolate cupcakes made by Yukino and Yui. Haruno comes in and asks Hachiman that is this the real thing that he wanted and says that he has disappointed her as she thought of him as a bit more interesting person to do things like that. And says that the way they are now is lame, and that she preferred the old Yukino. Even though it's not completely elaborated of the meaning of her comment, Hachiman's soliloquies on Haruno's comment after she left implies that, Haruno meant that the Yukino before was not someone who would have a pretense relation and would come straight with whatever she had to say.
Even though Yui,Yukino and Hachiman knew each others feelings, they didn't want to destroy the friendly relationship which was built over their time being together in club and continued it as though they were pretending not to know it. This pretence relationship was what Haruno called lame. By saying that she preferred old Yukino more, she forced them to break out of this loop of pretence relation which left them pretty much depressed for the whole day.
In the Episode 13 of season 2, after the events of episode 12, they somehow continue their relation as it is, but after school Yukino stops Hachiman and holds her hand on her bag but is hesitant to move forward or say anything, but it is implied that Yukino wanted to give Hachiman the chocolate she made for Valentine's Day (probably home made chocolate) but she didn't because Yui saw her chocolate and then things got awkward. Yui then tries to leave them alone, but Yukino stares at Yui implying not to do so.
In 2nd season OVA, there is a scene in which Yukino keeps walking and then stands beside Hachiman when they are in a shopping mall, and goes awkwardly silent.
Yui is the first best friend of Yukino. She considers Yukino's straightforward personality and harsh honesty as 'cool'. They played together in Chiba Summer camp at the river bank and also with fire crackers at the end of the camp.They get along well, to the extent of eating lunch together in the club room, sleeping over at Yukino's house, exchanging clothes, and regular emailing each other. In Episode 13 of season 2, Yui invited Yukino to her house to stay over at her place for the first time which is further insisted by Yui's mother who address Yukino by the same nick name as Yui.
Yukino also threatened Yumiko in a double tennis match for causing an event that led to Yui get hurt, where Yukino almost addressed Yui as her friendYui seems to understand that, Yukino is trying her best to get- along with her and decides to wait for her.They seems to enjoy hanging out together. On the third day of the school field trip, they spent time shopping together. It is clearly hinted that both of them hold their feelings for Hachiman in concern for each-other.
In the Light Novel, it was mentioned that Shizuka made Yukino become the member of the service club using Yukino's twisted sense of "nobleness oblige". Once, Shizuka teases Yukino with Hachiman as a pair which Yukino didn't get the true meaning or deliberately acted so. Shizuka also knows Yukino's ambition and wishes Yukino not to be a second Haruno and wanted her to work on her strong points. In Episode 1 of season 2 (adaptation of Volume 7) She gave Yukino her coat and asked her to accompany her and Hachiman to the ramen shop for ramen as a form of bribe to prevent her from revealing that Shizuka had snuck out.
In times of Christmas event, Shizuka told Hachiman about the possibility of some one in future may break Yukino's shell and understand her better but wants and wishes Hachiman to be that person. To help Hachiman in mending the service club relationship, Shizuka pointed out the reason which Hachiman overlook in taking up the Iroha's request, if he did it for Iroha or Yukino . Shizuka's words shocked Hachiman in realization of his possible miscalculation.
In the past Yukino was mentioned to give Hayama some valentine chocolate as mentioned by Haruno but Hayama explains that Yukino gave it to both himself and Haruno in times of their elementary school which Haruno didn't deny it.
OthersYukino, despite being a loner has a good reputation among her classmate. In light novel it was mentioned that in case of grouping for any events, Usually girls from the group ask her to join them and she used to choose which group she goes along with.Yui points out the reason for this as Yukino tends to give cool vibe and her class contains 90% girls.
Yukino once mentioned that she was jealous of Hachiman and Komachi's good sibling relationship. They seems to be on a good terms, and Komachi has high respect for her. They freely talk about various topic and Yukino genuinely care for Komachi and also her academics like a mother. Yukino also freely ask help from Komachi for which she is reluctant to ask Haruno, such as shopping for Yui's present, in preparing a magazine as part of a campaign by the Chiba region to promote "Love and Marriage" to teenager, etc.
Komachi appears to have noticed Yukino's feelings for her brother and slyly sets up a date-like situation between her and Hachiman. Yukino along with Yui and Hachiman selected Christmas present for Komachi. There are a lot of outings to which Yukino personally invites Komachi.
In Light novel, during tennis match Yumiko threatened to hurt Yukino but it backfired. After the rumor of Yukino and Hayama dating spread throughout the school, whom Yumiko has a crush on and friends with, enraged Yumiko grabbed Yukino's shirts collar which was blocked by Yukino herself. After all misunderstandings were cleared, Yumiko bowed her head and apologized to Yukino for all her past actions. To the surprise of all service club members, Yumiko also personally invited Yukino to the celebration of Hayama's victory in marathon, thus ending their enmity and are finally on good terms. Yumiko later requested the service club to help her make Valentine chocolate which Yukino personally helped her with, where they talk more casually than before. However Yumiko presented a shocked reaction, after learning that Yukino presented valentine chocolate in their younger days and releaved after the misunderstanding were cleared.
She showed hints of jealousy towards Iroha's closeness with Hachiman as when Hachiman volunteered himself to carry Iroha's belongings, she and Yui went speechless. However Yukino begins to show her soft side for Iroha and views her as a relying underclassmen and helps her in many ways and most situations.