Ruby Hoshino

Name: Ruby Hoshino

Gender: Female

Former Identity: Sarina Tendouji

Family:

Mother: Ai Hoshino

Twin Brother: Aqua Hoshino

Height: 158 cm

Occupation: Idol, entertainer

Affiliation: B Komachi, Ichigo Production

Ruby Hoshino’s soul comes from Sarina Tendouji, a terminally ill girl who was a passionate fan of Ai Hoshino.

Sarina was also a patient of Gorou Amemiya, a countryside doctor who supported her and shared her love for Ai.

After Sarina’s death, she was reincarnated as Ai’s daughter, reborn into the world as Ruby Hoshino.

Aqua Hoshino, her twin brother, is similarly reincarnated, though from a different previous life.

From infancy, Ruby can speak fluently, just like Aqua, retaining her past-life memories and personality.

Aqua knows that Ruby is also a reincarnated person, but for a long time he does not know she was Sarina Tendouji.

When they were in kindergarten, Aqua asked Ruby about her previous life, but she rejected the topic.

She told him that who she was in her past life did not matter and refused to answer, leaving both siblings unaware of each other’s true former identities until much later in the story.

Ruby is lively, bright, and pure-hearted, but she has strong likes and dislikes.

She tends to say exactly what she thinks without much filter, which can be both honest and harsh.

Her otaku tendencies from her previous life remain unchanged, and her intense enthusiasm often makes Aqua uncomfortable.

Despite her cheerful nature, she has a deep sensitivity to lies and a strong emotional core.

Unlike Ai Hoshino, who believed that “lies are a special kind of love,” Ruby openly declares that she hates lies.

She is extremely averse to lying herself and reacts sharply to lies told by others, noticing them quickly.

Because of the frustration and physical limitations of her previous life, Ruby develops excellent physical abilities early in childhood.

However, she is notably tone-deaf when it comes to singing, which contrasts with her natural talent for acting.

Physically and visually, Ruby has a star-shaped light in her left eye, mirroring the star motif associated with Ai.

Later in the story, when her motivation shifts to revenge, both of her eyes come to hold a darkened star-like light, symbolizing her new resolve.

Ruby has an innate gift for acting and performance.

She can slip into different personas with startling ease, using this ability both on stage and in real-life confrontations.

A key example is when Miyako Saitou tries to sell a scandal involving Ai Hoshino.

Ruby plays the role of a “divine” entity and psychologically overwhelms Miyako, intimidating her into obedience.

Her physical coordination and stamina, enhanced compared with her sickly previous life, make her well-suited for the demanding world of idols.

However, her lack of singing skill is a major hurdle that she must compensate for through stage presence, choreography, and charisma.

At the end of the second major arc of the story, Ruby enrolls in the entertainment department of Youtou High School.

This school specializes in students involved in the performing arts and entertainment industry.

Her school life and idol activities run in parallel, placing heavy demands on her time and mental health.

These pressures become increasingly important as her schedule grows more intense and her emotional burdens deepen.

In the second arc, Ruby dreams of becoming an idol like her mother Ai Hoshino, whom she admires deeply.

She auditions to follow in Ai’s footsteps, wanting to shine on stage just as her mother once did.

Aqua, however, secretly sabotages her early idol opportunities.

He does this to prevent Ruby from suffering the same tragic fate as Ai, who was murdered in connection with the entertainment industry.

Ruby is later scouted as an underground idol, which becomes a turning point in her career.

Rather than leaving her in the hands of an untrustworthy agency, Aqua and Miyako Saitou decide it is safer to manage her career within Ichigo Production.

She officially signs as an idol under Ichigo Production.

Aqua then recruits Kana Arima and MEM-cho, forming the new B Komachi with Ruby as one of the core members.

The group name B Komachi is inherited from Ai Hoshino’s original idol group, and Ruby’s member color is red, the same as Ai’s.

This symbolic link emphasizes her role as Ai’s successor in the idol world.

Ruby’s worldview is shaped by the painful experiences of her past life and her feelings toward Ai.

While Ai believed that lies were a powerful form of love and protection, Ruby cannot accept this philosophy.

She repeatedly declares that she hates lies and wants to live honestly.

As a result, she struggles to tell lies herself and has a keen instinct for detecting falsehoods in others.

This makes her very sensitive when people hide the truth, especially about matters involving her family and her past.

Her aversion to lies often puts her at odds with the more calculating and secretive approaches taken by Aqua and other adults in the entertainment world.

Aqua is Ruby’s twin brother, and they share an unusual bond as fellow reincarnated individuals.

Still, they keep the specifics of their past lives hidden from each other for a long time.

Aqua knows from early on that Ruby is a reincarnated person but not that she was Sarina Tendouji, his former patient.

Ruby similarly does not realize that Aqua is Gorou Amemiya, the doctor she adored and relied on in her previous life.

Their relationship becomes strained after Aqua reveals their true parentage to the public to neutralize a scandal targeting Kana Arima.

Ruby is furious that Aqua used their connection to Ai as a tool in the industry and rejects him, feeling betrayed by his willingness to exploit their identities.

Later in the ninth arc, Ruby secretly visits her former family’s home from her life as Sarina Tendouji.

She discovers that her former mother has effectively erased Sarina’s existence from her life, which shatters Ruby emotionally.

At the same time, Ruby is worn down by an overwhelming work schedule, pushing her mind to its limit.

In this fragile state, Aqua confesses that he is actually Gorou Amemiya, revealing his own past life to her.

Hearing this, Ruby and Aqua finally reconcile, their shared pasts brought fully into the open.

Ruby rekindles the same affection she had for Gorou, now directed toward Aqua, and regains emotional stability.

In her previous life as Sarina Tendouji, Ruby deeply admired and trusted Gorou Amemiya, her doctor.

He supported her through her illness and fueled her dreams of idols and the entertainment world.

One of Ruby’s hidden motivations for reviving B Komachi is her desire to reunite with Gorou someday.

She believes that by shining as an idol and reaching the top, she might somehow reconnect with the doctor who meant so much to her.

In the sixth arc, titled “Private,” Ruby finally learns of Gorou Amemiya’s death.

This revelation devastates her and becomes the catalyst for a darker, more determined purpose.

From that moment, she resolves to find the mastermind within the entertainment industry responsible for the tragedy surrounding Ai.

Her yearning for Gorou transforms into a burning desire for revenge against the hidden culprit behind these events.

When Aqua later reveals that he is Gorou reincarnated, Ruby’s feelings from her past life resurface unchanged.

This revelation restores her inner light and gives her a new, more focused determination to move forward.

After learning about Gorou’s death and the reality of Ai’s murder, Ruby’s outlook grows far more intense.

Her eyes, once holding a bright star, now harbor dark star-like lights in both irises, symbolizing her fixation on vengeance.

From the seventh “mid-career” arc onward, Ruby follows advice from Ichigo Saitou and adopts a ruthless approach to achieving success.

She begins to use every available means, no matter how harsh, to raise her profile in the entertainment world and secure influence.

Her pursuit of popularity is no longer only about shining as an idol but also about gaining the power needed to expose and punish the mastermind.

This evolution brings her closer in spirit to Aqua’s own revenge-driven path, even as their methods sometimes clash.

Through these changes, Ruby becomes a formidable presence in the industry.

Her combination of charm, ambition, and a willingness to cross lines when necessary makes her both captivating and dangerous.

The eighth arc highlights a major rift between Ruby and Aqua.

Aqua publicly reveals that they are Ai Hoshino’s children to protect Kana Arima from a scandal, using their lineage as a shield.

Ruby is enraged by this act.

She cannot accept that Aqua exposed such private information as a strategic move in the entertainment world.

Feeling that her identity and connection to Ai have been exploited, Ruby shuts Aqua out.

Their relationship deteriorates, and Ruby struggles under the combined weight of emotional conflict and work pressure.

In the ninth arc, after her painful visit to her former family and emotional breakdown, Aqua chooses to fully open up to her.

He reveals that he is Gorou Amemiya, thus finally connecting Ruby’s past and present.

This confession allows Ruby to understand Aqua’s actions and pain more deeply.

They reconcile, and Ruby once again allows her brother back into her emotional world, this time with no secrets between them.

After rediscovering her emotional strength through Aqua’s (Gorou’s) words, Ruby’s eyes regain their bright star-like light.

She no longer acts only out of grief and anger; she now has a clear vision of the future she wants.

Ruby decides to aim higher than even Ai Hoshino ever reached, declaring her goal of becoming an idol who surpasses her mother.

This ambition defines her new phase of growth and drives her actions in the later parts of the story.

By stepping into the role of Ai’s true successor, Ruby becomes a fateful and central figure in the overall conflict.

For Hikaru Kamiki, a key figure tied to the tragedies surrounding Ai, Ruby emerges as the greatest threat and a destined target.

Her rise in the entertainment world is no longer just about fame or personal dreams.

It now intertwines with a larger, ominous struggle against Hikaru Kamiki, making her path one of both glory and danger.

Ruby is one of the driving forces behind the re-formation of B Komachi under Ichigo Production.

The group is reassembled with Ruby, Kana Arima, and MEM-cho as the core members, with Ruby inheriting Ai’s red as her member color.

Her primary goal at first is to fulfill the dream that Ai never achieved: a dome concert.

This dream contains not only admiration for Ai but also Ruby’s personal wish to rewrite the tragic legacy of her family.

Guided by Ichigo Saitou’s shrewd management and her own escalating determination, Ruby rapidly gains popularity.

Even with a lack of vocal skill, she compensates with powerful performance, charisma, and a strong media presence.

By the final arc, Ruby and B Komachi succeed in accomplishing Ai’s unfulfilled ambition.

They hold and complete a dome concert, marking a major turning point in Ruby’s life and career.

This performance stands as the culmination of Ruby’s journey to that point: a tribute to Ai, a statement of her own identity, and a step toward confronting the darkness behind the entertainment world.