Ruby Hoshino/Relationships

Aqua Hoshino
Ruby's older brother who's very overprotective of her sister, not wanting her to walk the same path that killed her mother. She and her friends often call him a "sis-con" due to this and the lengths he goes to prevent her from achieving her dreams. Often, she is hindered by his presence and is annoyed by his personality, as seen when he puts on a face when he first enters a dating show. These scenarios are incredibly off-putting for her and her colleagues.

As time goes by, he becomes more and more accepting of his sister's wishes and even goes as far as to help her group prepare for their gigs. He disguised himself as Pieyon to prevent any problems in coordinating their dances and singing. He and Ruby are closer than one might think, but not to the point where they are aware of who was who in their past lives.

In Chapter 53, Ruby is curious about why Aqua goes home late daily. Melt informs her that he's been seen going home together with Akane for a while. Ruby becomes suspicious and tries to ask him about this before Minami warns against this. When Minami suggests they are doing lewd things, Ruby is initially frantic but soon becomes serious as she cannot imagine her brother risking pregnancy with a high school girl. She adds that she would lose all respect for him if he did.

By Chapter 71, she sees a positive change in Aqua's demeanor after he offers to make breakfast for them. In Chapter 74, she asks Akane what her brother threatened her with to get such a beautiful person to go out with him, much to the eavesdropping Aqua's chagrin at being painted in such a bad light. She requests Akane to take care of her 'incompetent' brother for a long time after asking when they intend to get married and permission to call her big sister.

In Chapter 106, after Aqua reveals their mother's secret to the public, Ruby's relationship with her brother is heavily strained. Her opinion of him deteriorates, as she believes he is a liar like everyone else. She even goes as far as saying she can't think of him as a family anymore.

In Chapter 122, after Ruby has a meltdown, Aqua reveals to his sister that he is the doctor that took care of her in their previous lives. This makes Ruby feel incredibly glad and relieved by learning he reincarnated as her brother, and jumps into his arms giving him a deep hug, crying out of happiness.

Ai Hoshino
Ai is Ruby's biological mother. Even in her past life as Sarina, she was a big fan of her and her work. She was elated when she reincarnated as her daughter, as she was able to get to experience her dream before her goal of becoming an idol. She was spoiled and demanded her mother's attention whenever she was around. She would utilize every moment to fawn over Ai so she could spoil and dote on her. When she was still alive, her mother reflected on how similar she was to an Otaku after Ruby complimented her smell and asked what shampoo she used despite using the same ones. After her mother's passing, she was determined to follow in her footsteps and prayed to her tombstone regularly to update her on her life.

Ichigo Saitou
Ruby's adopted father. After Ai's death, he became distant from his family. After becoming an idol, Ruby comes to him looking for anyone connected to Ai. He promises to tell her if she becomes popular and provides some pointers on how to do so. He also helps her by using his connections to get her bigger and more popular roles.

Miyako Saitou
Miyako was Ruby and Aqua's babysitter, but later became their adopted mother. Miyako never once tries to stop Ruby from becoming an idol, even deciding to relaunch the idol division of Strawberry Productions just for her to pursue her dreams.

Kana Arima
Despite sharing a long history, Ruby only recently started seriously interacting with Kana when the latter joined her idol group. They first met as children on the film set That Was the Start. However, due to Kana's cocky personality back then, Ruby immediately developed a poor opinion of her. Similarly, Kana disliked Ruby because the latter continuously got her nickname wrong.

After their first meeting, Ruby and Kana would not see each other again until high school. While their relationship was still on a bad note, things took a drastic turn when Strawberry Productions began scouting for a new idol group. After Aqua pointed out that Kana was a freelancer, Ruby quickly realized her potential but was hesitant to approach her due to their bad standing with each other. As a result, while Ruby swallowed her pride and asked her to join, Aqua was forced to be an in-between by arranging their meeting, and he was ultimately the one who convinced her.

After Kana joined Strawberry Productions, while they still occasionally banter, Ruby's relationship with her improved. In a way, Kana becomes a sort of mentor figure to Ruby, teaching her about the ways of the entertainment world. Conversely, whenever Kana gets depressed, Ruby is regularly the one who cheers her up. They also often gossip about Aqua and share a dislike for his moody personality.

Mem-Cho
A member of Ruby's idol group. Recruited by Aqua after their performance in LoveNow, Mem's notoriety as an online personality greatly enhanced the group's fame. Despite Mem being 25 years old upon her admission, way past the ripe age for an idol, Ruby accepts her because they share the same childhood dream. Ruby looks up at her and comments on how she was a cutie when they first met. They are also optimistic hard workers, which propels their friendship further.

Pieyon
Ruby and Pieyon seem to have been long acquaintances through the latter's affiliation with Strawberry Productions. She finds working with him a joy, and he appears to be one of the few co-workers she genuinely respects, propelling him to silence Kana when she doubts his popularity.

Shun Yoshizumi
Ruby meets Shun while working as the reporter of Dig Deep! One Chance. While it's ambiguous if she truly cares for or at least sympathizes with Shun deep down, her being nice to him is mainly so she can use him as an investment for her career as per Ichigo's advice to be kind to the assistant director to build up a relationship, in the hopes that Shun might become the main director in the future. Shun mistakes Ruby's friendliness as him being her type.

Later after a scandal on the show, Ruby invites Shun to become her manager, which he accepts.

Frill Shiranui
Frill is Ruby's classmate and friend. She is often seen bantering with Ruby and Minami. Later they would get the chance to work together for 15 Year Lie.

Minami Kotobuki
Minami is Ruby's classmate and friend. She is often seen bantering with Ruby and Frill. She once accompanies Ruby to visit Aqua during the rehearsals of the Tokyo Blade stage adaptation. Ruby would later invite her to take part in the cosplay segment of Dig Deep! One Chance.

Akane Kurokawa
In Chapter 29, Ruby sees her mother in Akane and subconsciously utters 'mama' after coming across a video of hers. In Chapter 41, Ruby is seen following Akane's account since she was her brother's girlfriend. At that point, Aqua told Ruby beforehand that they only have a professional relationship. This causes Ruby to ruminate how scummy guys like him are the worst for not taking a 'cute' girlfriend like Akane seriously. Ruby then vows to be nice to Akane when they finally meet face to face, hoping that day comes soon.

In Chapter 74, Ruby is ecstatic that she finally met Akane in person. She is instantly captivated by her looks and praises Akane's beauty and cuteness. Akane returns the gesture while remaining humble, complimenting Ruby as someone much prettier than herself, causing Ruby to beam in delight.

Ruby is elated over her praise and asks if she can call her 'big sister'. She shares how she always wanted an older sister and began questioning Akane when she would officially marry Aqua to become her sister-in-law. When interacting with the enthusiastic Ruby, Akane could only blush in response. Ruby then earnestly asks Akane to care for her 'incompetent' brother for a long time using the wedding vow phrase 'In sickness and in health'.

In Chapter 77, Ruby is euphoric as she asks Akane to share a room with her tonight. Akane agrees as she returns Ruby's embrace. Ruby begins signing merrily about the sleepover as they make their way back. Ruby then shares how familiar she is with 'this place' and how significant it is to her. She then invites Akane to join B-Komachi as well, but Akane is apprehensive as she needs much work to do anything that’s not her forte.

Akane then asks if she’s interested in becoming an actress. She is happy to see they have the same interests and offers to guide her if she wants. Ruby is delighted but says she will do so after accomplishing her dreams of becoming an idol. Suddenly, she asks Akane about her views of an appropriate age gap. Surprised at the change in subject, Akane replies that their mental state and age matter the most to her, but she would be fine with a 10-year gap. The frantic Akane asks the reason for the sudden girls' talk, with Ruby chuckling in response.

Ruby confesses that she has a crush and the history behind said crush to Akane, stating 'sensei' gave her a purpose and that without him, she wouldn’t be able to live. Akane empathizes and understands her feelings, stating that having someone she loves is good. Akane agrees that a little age gap won’t matter in the face of true love and that she’s willing to help her little sis to go on the offensive. Ruby was overjoyed but stated that she was unaware of where he went.

Ruby trusts Akane enough to reveal all the embarrassing advances she once made, only to be rejected. Akane could only blush in response as she listened to Ruby venting. Despite Ruby's personality change, she still protects Akane's and Aqua's relationship as she chastises her friend for aiming for her brother when he already has a pretty girlfriend.

Masaya Kaburagi
Ruby meets Masaya when she invites him to a B-Komachi concert and applies to be a reporter for Dig Deep! One Chance, which the latter gladly accepts due to her chemistry with Aqua. However, while acknowledging her acting talent, Masaya initially wanted to cast a more well-known performer in the starring role of Taishi's upcoming film, the 15-Year Lie, when the director recommended her.

Taishi Gotanda
Ruby and Taishi seem to be long acquaintances through the latter's relationship with her brother. Noticing her strong resemblance to Ai, Taishi wants to cast Ruby in the film about her mother that he is making.