Ruby Hoshino/Relationships

Aquamarine Hoshino
Ruby Hoshino's older brother. He is very overprotective of her sister; not wanting her to walk the same path that killed her mother. He is often called a "sis-con" by her and her friends 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 entered a dating show: these scenarios being incredibly off-putting for her and her colleagues.

As time goes by, he becomes more and more accepting of her sister's wishes and even went as far as to help them prepare for their gigs. He disguised 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 aware of who was who in their past lives.

In chapter 53, Ruby was curious as to why Aqua was going home late every day. Melt informs her that he's been seen going home together with Akane for awhile. Ruby became suspicious and tries to ask him about this before Minami warn against this. When Minami suggested that they were doing lewd things, Ruby was frantic but soon became serious as she couldn’t imagine her brother risking pregnancy with a high school girl. She adds that if he did, she would lose all respect for him.

By chapter 71, she sees a positive change in Aqua's demeanour after she offered to make breakfast for them. In chapter 74, she asks Akane on 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 request 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.

Ai Hoshino
She is Ruby Hoshino's mother. Even in her past life as Sarina, 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 in becoming an idol. She was spoiled and demanded her mother's attention whenever she was around. She would utilise every moment to fawn over Ai so she could spoil and dote on her. When she was still alive, her mother reflects how similar she’s like to an Otaku after Ruby complimented her smell and asked what shampoo she uses despite using the same ones. After her mother's passing, she was determined to follow in her footsteps and prays to her tombstone regularly to update her on her life.

Mem-Cho
She is the first member member of Ruby's newly revived idol group B-Komachi upon Aqua's recommendation. Initially being picked up by Aqua after their performance in "LoveNow": she uses her talents, experience, and notoriety for the group's fame. Despite being the oldest in the group, way past the ripe age for an idol, Ruby was accepting of her, as they shared the same dreams, and still looking completely eligible for an idol. Ruby looks up to her and comments how she is a cutie when they first met. Both of them are optimistic hard workers, which only serves to further propel their friendship.

Kana Arima
Ruby and Kana shares a long history but only started interacting with one another recently when Kana joined her group. They've known each other since they were just children and currently attends the same high school. They often talk to each other about their line of work and due to Kana's infatuation towards Aqua, they are able to continuously banter on about him.

They both share the same dislike towards his personality and his unwillingness to do much. Ruby is aware that Kana is a talented actress and may go back to being one soon, and so, she takes her presence in their group seriously.

In chapter 74, Ruby was unfazed by Kana's rude remarks about her and comments how she's 'bitchier' than normal.

Akane Kurokawa
In chapter 29, Ruby saw 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 had told Ruby beforehand that they only had 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 was ecstatic that she finally met Akane in person. She was 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 was elated over her praise and asks if she could call her 'big sister'. She shares how she always wanted an older sister and began questioning Akane on when she will marry Aqua so as to officially become her sister-in-law. When interacting with the enthusiastic Ruby, Akane could only blush in response. Ruby then earnestly asks Akane to take care of her 'incompetent' brother for a long time using the wedding vow phrase 'In sickness and in health'.

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

Akane then asks if she’s interested in becoming an actress. She was happy to see they have the same interests and offers to guide her if she wants. Ruby was delighted but says she will do so after accomplishing her dreams of becoming an idol. Suddenly, she asks Akane on her views of an appropriate age gap. Surprised at the change in subject, Akane replies that it’s the mental state and age that matters 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 confess that she has a crush and the history behind said crush to Akane, stating 'sensei' gave her a purpose and without him, she wouldn’t be able to live on. Akane empathise and understands her feelings, stating that it's good to have someone she loves. 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 states that she's unaware of where he went.

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