Kana Arima/Relationships

Mother
Her mother has always aspired to be an actress however, being unable to accomplish it herself, she imparted all her wishes onto Kana. As Kana's popularity grew as a prodigy actress, she was happy that her mother could meet her favourite entertainers. In those times, she was all smiles and affection to Kana. However, once her popularity dipped, she became extremely toxic to everyone around her. She became neglectful of their entire family, causing the young Kana to think that in order for happiness to be restored, she had to survive in the industry.

Aquamarine Hoshino
She started acting with Aqua when she was 4 years old. She was extremely pompous and arrogant during their first meeting which he admits to wanting to strangle her back then. After their first performance, she was absolutely amazed and humbled at the disparity of their individual abilities. It would be a long time before they meet again, though that incident made her subconsciously limit her own acting abilities. She met him again in high school and became friends with him. She also secretly developed romantic feelings for him along the way.

When Akane and Aqua kissed on the show, she wept profusely in her room and called him a jerk. Attempting to move on from him, she looked for other forms of escapism. On one occasion, she met Pieyon a mascot who unbeknownst to her was actually Aqua in disguise and began to have feelings for him. She eventually found out that it was Aqua underneath the costume and vows to make him like her.

On his end, he has found her personality to be extremely distasteful and admits to Akane that Kana was always rude. That said, he still appreciates her presence in his sister's life and greatly values her worth and skills as an actor. In a myriad of situations, he has went out of his way to help her out in different situations, further amplifying her crush on him.

After recognising how Kana was intentionally suppressing her acting skills for others, he purposefully made sure the spot light was on her so she couldn’t run away from it. Kana was then able to truly be herself and smiled widely that she no longer have to hold back. She internalise that Aqua always drives her crazy by doing things such as these and since he wanted to see her perform, she wants him to look at her more.

After Aqua found out that his goal was finished before it even began, he became more warm and receptive to those around him. Kana saw his change and comments that she likes his new demeanour. In the recent chapters, Kana refers to Aqua by his first name while he still refers to her by her family name.

When B-Komachi is about to go on a trip to Miyazaki to shoot their new music video, Ruby invites Aqua to come with them and Kana can be seen staring at the siblings anxiously. When Aqua agrees to go, her expression quickly changes into a happy one. Kana offers to help him prepare for the trip, but he declines because he has a date with Akane. Kana becomes unhappy and then suggests that they go tomorrow. Aqua agrees and as he leaves, Kana gloomily asks why are they still keeping up appearances when the LoveNow show already ended. She then wonders when will Aqua and Akane break up.

On the day of their appointment, Kana arrives late due to her overthinking which clothes suits her best. Aqua waits for her in a cafe, and when she wants to pay for their drinks, Aqua ends up doing it. Kana tells him that it was a smooth move, making Aqua confused. When they are choosing suitcases, Kana tells him to pick his favorite color. Aqua proceeds to pick the white one and Kana realizes that is her lightstick color. Aqua then offers to carry Kana's handbag but she declines. When it's almost night time, Kana says that she's hungry and Aqua brings her to a famous meat restaurant. To her surprise, Aqua already reserved seats for them. Kana asks him why is he seems so familiar with dates and how to treat women, and suspects that he has played with girls, which Aqua denies. Aqua says he planned all that so Kana can enjoy herself. Kana then asks Aqua about his relationship with Akane, and Aqua says that he always believed he should never get into a relationship, but he starts to think about his relationship with Akane seriously. Kana encourages him, saying that a freedom to love is a human right. When Aqua calls a taxi to drive her home, Kana imagines that he will bring her into a more romantic place, when in truth, he just sends her home.

After visiting his home in Miyazaki, Aqua and Akane go to B-Komachi filming location. When Kana approaches Aqua and Akane, Aqua looks at her in awe. When Akane finishes fixing Kana's outfit, Kana asks Aqua for his opinion. He thinks for a second and answers that she gets a passing mark, which Kana responds angrily that both Aqua and Akane should compliment her honestly. Later, Aqua and Akane observe Kana while she is filming a dance part of the music video. Akane asks him if he thinks Kana will become a great idol, and he says yes. Akane says that if that's the case, Aqua can no longer go on dates with Kana, because it would cause a scandal. Aqua agrees with Akane, saying that he had been careless and is reminded of how Ai died.

Aqua was seen to have told the still obstinate Kana that he was going out with Akane for real. 6 months after being official, Kana still hasn’t gotten over her crush on him. She tells Mem that she is supportive of their relationship but she is hurt because Aqua is intentionally avoiding her.

When Mem confronts Aqua about his treatment to Kana, he tells her that he is deliberately avoiding Kana because he is afraid of what will become of her if she, an idol, causes her fans to think that she has a boyfriend. He is afraid of Ai's fate happening to another person, worse if he was the one that caused the fans to misinterpret the situation. He doesn’t want to experience that dreadful day again and is afraid of taking responsibility if that fate comes to pass. He was afraid of becoming that man he once was. Mem realizes that although Kana is fixated on Aqua, he on the other hand, is more concerned about her future, so much so that it could break him for good if Kana becomes another Ai.

When Aqua picks up Akane after a job, she muses that she has realized for a long time that Aqua holds a deep interests in Kana, be it in her future or as a person, but has recently decided to avoid her entirely. She doesn't know the reason as to why he chose to date her instead of Kana but after examining his personality, many could tell he was a 'philandering cad', so she has to keep a watchful eye on him. After dating for real, Akane appreciates how Aqua became authentic towards her compared to the past.

Melt Narushima
Melt is one of Kana's closest male friends and has worked with her on a number of performances. She was there for him during his first debut on Sweet Today and they were chosen together to be in Tokyo Blade. They actively look out and genuinely care for one another. During their practice sessions, Melt would patiently listen to her complain about the ludicrous closeness between Akane and Aqua despite it being a business relationship while also giving his own personal inputs defending them. Melt is extremely grateful for Kana as he recognised how she limited herself to make him look good in Sweet today, thus, for months after ward, he trained and resolved to prove himself worthy of her kindness.

When Taiki invited her to grab a bite, she immediately drag Melt along, much to his surprise. Melt praised her for being really smart as she taught him to read Kanji, while the latter brought books along after he revealed he doesn’t read much.

When visiting the Mangaka's house, Kana went with Melt while Aqua brought Akane along despite her not being involve in Sweet today. After the script was rewritten, Melt became anxious and was dreading whether he could be up to standard. After being told that his failures would stand out amongst the talented casts, he refused to let them weigh him down and instead asks Kana to rehearse with him. Kana immediately accepts citing that she was about to ask him that herself.

Chapter 57 shows his flashback, in it he reexamines his old performance. He recognised his incompetence and how Kana had to adjust her acting for him. He was furious at himself for being a failure and wept while wondering if the production could had been better if he'd taken it seriously. When Melt and Kana were training their running, Kana was surprised he could keep up. He reveals that he’s been training since that day, causing Kana to blush slightly.

When Kana and Akane goes into their usual quarrels, Melt is commonly seen by her side to rein her in while Aqua takes care of Akane. He was curious as to why she would often antagonise and pick a fight with Akane, and advised her to get along with Akane since she’s dating Aqua. She reiterates once again that it's just for business and that their personalities are too different, inevitably running into conflict. Additionally, she is against losing to her and doesn’t find her talents inferior to Akane in any way.

During their performance, Kana was impressed and moved by his emotional acting. She then tells him that she'll take it from here after he more than fulfilled his role. Melt then admits for the first time that thanks to her, he finds acting to be extremely fun.

Taiki Himekawa
As Taiki won the most impressive actor award and is rather well-known in the public, Kana has a great deal of respect and admiration for him. They were sorted into the same group in Tokyo Blade and during one of their sessions, he tells her to not hold back. This causes Kana to smile gleefully and let herself loose, immediately captivating those around her. Taiki then invites her to go out to eat which she quickly accepts as she has many questions to ask him.

Throughout their practice sessions, they started getting closer as she became something like a Kanji teacher to him and Melt. The three of them was labelled the Main clique. Akane and Aqua were determined to defeat the duo of Taiki and Kana, causing them to become their end goal and rival of Tokyo Blade. Kana then asks him of Akane past, which he reveals that she was her fan when they were young. He immediately regretted telling her after Kana continuously started teasing Akane for it.

When asked by Melt whether who's the better actor between Akane and Kana, he didn’t pick a side and instead listed out both their talents. However, he proclaims that Kana would win this time since he's on her team in the play.

Ruby Hoshino
Ruby is Aqua's twin sister and also her partner, Ruby misheard her nickname "A Genius Child who would Flick a Crying Switch" into "A Genius Child who would Lick a Flying Snitch" which made Kana mad, Ruby and Kana later became partner idols. She dislikes Ruby's intense personality but also admires her for her bubbling personality and her ability to live as she wants.

Mem-Cho
Mem-cho acts like a mentor and big sister to Kana due to her age and experience. Therefore, she also knows how to make Kana act in certain ways. For instance, despite initially rejecting the idea of filming their room as content, Mem-cho was able to convince Kana after stating that all things inside would be considered business expenses.

Kichijouji Yoriko
She is the author of "Sweet Today", the manga that was adapted into a TV-series with Kana as the female lead. As a fan of the manga, Kana admires her and was sad about the disappointing adaptation she was part of. Yoriko holds Kana in high regard for being one the two (second being Aqua) that saved the adaptation in her eyes and are on friendly terms.