Ruby Hoshino

1. Kana Arima: The Rival and Loyal Friend Kana is arguably Ruby's most important relationship outside of her family. Initially, their connection is marked by friction; Kana is a cynical, seasoned, and disgraced acting prodigy, while Ruby is the energetic newcomer. Dynamic: Ruby admires Kana's talent, but also constantly pushes her to give her best. Kana, in turn, sees in Ruby the charisma she feels she has lost. Evolution: Despite their fights, Kana becomes the pillar of the new B-Komachi. When Ruby falls into her dark phase ("Dark Ruby"), Kana is one of the few people who tries to reach her, maintaining an unwavering loyalty that helps Ruby not to be completely consumed by her hatred.
2. MEM-cho: The Mediator and Confidant The relationship with MEM-cho brings stability to the group. Being older than the other members, MEM-cho acts as an older sister and mediator between Ruby and Kana's explosive personalities. Bond: Ruby trusts her to navigate the world of social media and marketing. MEM-cho brings lightness and humor to Ruby's life, reminding her that, despite her traumas, she is still a young woman who can enjoy her career.
3. Akane Kurokawa: A Complex Relationship Although Akane is primarily the partner (or love interest) of her brother Aqua, her relationship with Ruby is one of mutual respect and, at times, unsettling similarity. Connection with Ai: Due to Akane's uncanny ability to mimic Ai Hoshino, Ruby feels an instinctive attraction to her, seeing glimpses of her mother. Akane, for her part, is one of the few who quickly notices the change in Ruby's gaze when her stars turn black, trying to understand her pain from a psychological perspective.
4. Classmates and Industry Colleagues Ruby also interacts with other young talents like Frill Shiranui and Minami Kotobuki. These friendships represent the more "normal" side of her life.

1. Sarina's Spark: Vitality and Desire At her core, Ruby is an extension of Sarina Tendoji. After a past life marked by the immobility of a terminal illness, her initial personality as Ruby is an explosion of hyperactivity and optimism. She is extroverted, competitive, and possesses an almost childlike joy. This facet represents her "right to live": Ruby doesn't just want to be an idol; she wants to devour life, move, dance, and receive the affection that was denied her. Her determination is unwavering; she doesn't accept defeat because she already knew the ultimate end in her past life.
2. The "Divine" Charism and the Heritage of Ai Ruby possesses a magnetic personality inherited from her mother. She can captivate the masses with effortless grace, but behind that smile lies an obsessive perfectionist. She understands that the entertainment industry is a game of lies, and although initially more honest than Aqua, she learns to cultivate a facade of perfection. Her pride is immense; she isn't content to be Ai's shadow, but strives to surpass her, which sometimes makes her appear arrogant or stubborn to her fellow B-Komachi members.
3. The Descent: The "Dark Ruby" Facet The most drastic change occurs when the trauma of Goro and Ai's deaths mixes with a thirst for revenge. A cold, calculating, and manipulative personality emerges. Her eyes show black stars, and her charisma becomes oppressive. In this state, Ruby abandons her empathy, using people as stepping stones in her rise to power. She becomes cynical about the industry, displaying a chilling maturity that contrasts sharply with her "cheerful girl" image, demonstrating that she is capable of a darkness equal to or greater than that of her brother, Aqua.
4. Redemption and Final Synthesis After discovering that Aqua is Goro, her personality finds balance. She ceases to be a lone avenger and becomes a resilient woman. This final version of Ruby integrates her past vulnerability with her current strength.

Origin and Reincarnation Like Ruby, Aqua is a reincarnation. In his previous life, he was Dr. Goro Amamiya, the gynecologist who delivered Ai Hoshino's secret baby and cared for Sarina (Ruby's past life) at the hospital. Goro was killed by a stalker just before giving birth, and he was reborn as the son of his idol. This past identity grants him a mature, pragmatic, and protective mindset from birth, though for years he remains unaware that his sister Ruby is actually his former patient, Sarina. Personality and Motivation Unlike Ruby's emotional passion, Aqua is defined by his cold and calculating intellect. After witnessing Ai's murder, his life ceases to belong to him and becomes solely dedicated to revenge. He becomes convinced that the killer had an accomplice (his biological father) and devotes every fiber of his being to finding him. Method Actor: Aqua possesses immense acting talent, but he uses it as a tool to infiltrate the entertainment industry and obtain information. The Shadow Protector: His love for Ruby is absolute, but it manifests in a controlling way; he tries to prevent her from becoming an idol so that she does not suffer the same fate as Ai, which generates constant friction between them. Relationship with Ruby and Evolution For much of the story, Aqua and Ruby walk separate paths: she toward the spotlight and he toward the shadows of conspiracy. Aqua even goes so far as to manipulate situations to protect her sister's career, even at the cost of her own happiness. The climax of their relationship occurs when they finally discover each other's past identities. For Aqua, learning that Ruby is Sarina is redemption: the little girl she couldn't save in the hospital is alive and thriving. This bond strengthens her resolve to sacrifice herself, if necessary, to ensure that Ruby can shine without fear.

Origin and Ascent Ai had a tragic childhood; she was abandoned by her mother and grew up in an orphanage, which prevented her from understanding what true love is. She was recruited by Ichigo Saitou to be the center of the idol group B-Komachi. Despite not knowing how to love, Ai decided that her career would be based on "lies": acting as if she loved her fans in the hope that, one day, that lie would become the truth. The Secret Pregnancy At 16, at the height of her career, Ai became pregnant with twins. To protect her image and that of her group, she temporarily retired under the pretext of a health problem, giving birth secretly in a remote hospital. There she met Dr. Goro (Aqua's reincarnation) and Sarina (Ruby's reincarnation). After the children's birth, Ai returned to the stage, balancing her life as Japan's most brilliant idol with that of a devoted mother who kept her children hidden from the world. Death and Legacy On the day of her highly anticipated concert at the Tokyo Dome, a stalker—guided by the twins' father—stabbed her at her front door. Ai bled to death while her children listened from outside. In her final moments, she had an epiphany: as she told Ruby and Aqua that she loved them, she realized that, for the first time, it wasn't a lie. Personality and Symbolism The Stars: He possessed permanent white stars in both eyes, a symbol of supernatural charisma and a talent capable of manipulating the emotions of the masses. The Mask: Ai was a master of professional deception, but in private she was a vulnerable young woman who only wanted a real family. Her death not only left a void in the industry, but also became the driving force behind Aqua's quest for revenge and the dream Ruby strives to achieve. For Ruby, Ai is not just her mother, but the deity she aspires to emulate on stage.

1. The Origin of Trauma: The Lalalai Company Hikaru began his acting career as a child with the Lalalai Theater Company. During his adolescence, he was subjected to abuse and emotional manipulation by adults in the entertainment industry, specifically by Airi Himekawa (a famous actress older than him). This toxic environment, where success and image were everything, fractured his psyche at a very young age. Hikaru was forced to "grow up" too quickly in an environment where people were treated as tools or consumer products.
2. "Shine" as a Deadly Obsession For Hikaru, the talent and beauty of stars (especially idols and actresses) are not something to be admired, but rather something to be "preserved" through death. His psychopathic logic dictates that a star is at their peak of perfection precisely when they shine brightest. By murdering these young hopefuls (or inducing their deaths), he believes he is "freezing" that beauty forever, preventing time, decay, or failure from tarnishing their splendor. It is a macabre form of collecting where human lives are his trophies.
3. The Encounter with Ai Hoshino When Hikaru met Ai, she was 15 and he was barely a teenager. They both shared the emptiness of never having been genuinely loved. However, while Ai tried to fill that void by learning to love her children, Hikaru sank deeper into his darkness. After the twins were born, Hikaru felt that Ai's brilliance was too intense and dangerous for him to control. Ai's murder was not just an act of jealousy or spite, but the culmination of his philosophy: to kill the "perfect star" so that she would never cease to be so in his memory.
4. Narcissistic Psychopathy Hikaru operates with absolute coldness. He feels no remorse because he sees the world as a stage where he is the only true director. He enjoys watching the suffering of those left behind.

1. Identity: Hikaru Kamiki After a thorough investigation by their brother Aqua, it is revealed that the twins' biological father is Hikaru Kamiki. In his youth, Hikaru was a prodigy actor associated with the Lalalai Theater Company, where he met Ai Hoshino when she was just 15 years old. Physically, he shares traits with his children, including the characteristic star-shaped eyes, which symbolize exceptional talent and charisma, but in his case, tinged with a deep malevolence.
2. The Profile of a Predator Hikaru is no ordinary absent father; he is portrayed as a manipulative psychopath and a serial killer of celebrities. His modus operandi involves approaching promising young entertainers at the height of their fame and then taking their lives, either directly or through intermediaries (like the stalker who killed Ai). For him, the value of a life lies in its "brightness," and he derives a perverse gratification from extinguishing those lights at their peak.
3. Impact on Ruby's Life For much of the series, Ruby is unaware of her father's identity. However, when she discovers the truth about the deaths of Ai and Goro Amamiya, her perception of the world changes radically. The Engine of Revenge: Upon realizing that her father masterminded her mother's murder, Ruby develops her "black stars." Her ambition to become the number one idol becomes a tool to attract Hikaru's attention and expose him. The Dark Mirror: The relationship is tragic because Ruby inherited her father's magnetic charisma. When acting or singing, Ruby often walks a fine line between Ai's pure brilliance and Hikaru's icy manipulation.
4. The Final Conflict Hikaru's existence represents the ultimate "lie" in Ruby's life. While she seeks love and recognition, her father represents the destruction of those very values.

1. Ai Hoshino: The Mother and the Idol Ai is the sun around which Ruby's life revolves. For her, Ai was not only her biological mother, but also her reason for living in her past life as Sarina. Their relationship is a mixture of filial love and religious devotion. Ai's death before her eyes fractured Ruby's psyche, leaving a void she tries to fill by becoming an idol herself. Ruby inherits Ai's "divine" charisma and starry eyes, but also the burden of maintaining a facade of perfection before the world.
2. Aquamarine (Aqua) Hoshino: The Twin Brother Aqua is Ruby's protector and often her emotional antagonist. Although they share a blood bond and the secret of being the children of an idol, their relationship is strained due to their opposing visions: while Ruby seeks the limelight of the stage, Aqua delves into the shadows of research. What Ruby is unaware of for much of the story is that Aqua is the reincarnation of Goro Amamiya, the doctor she loved in her past life. The discovery of this shared identity is the only event capable of healing the hatred in Ruby's heart, transforming their rivalry into unwavering mutual support.
3. The Adoptive Family and the Past Miyako Saitou: After Ai's death, the wife of the president of Ichigoe Productions assumes the role of adoptive mother. Miyako is the pillar of stability in Ruby's life, providing her with the genuine maternal care that the industry had taken from her. The Tendoji Family: In her past life as Sarina, Ruby suffered abandonment by her biological parents, who left her to die alone in the hospital. This trauma of rejection is what makes Ruby so desperately value Ai's love and Aqua's loyalty.

The Awakening of a Second Life Originally Sarina Tendoji, a terminally ill patient who spent her childhood confined to a hospital bed, finding solace only in videos of the idol Ai Hoshino, she miraculously reincarnates as Ruby, her idol's daughter, after her untimely death. This new existence grants her the healthy body and beauty she always longed for. During her early years, Ruby lives a dream: she is loved by the person she admired most and grows up alongside her twin brother, Aqua. However, this paradise shatters when she witnesses Ai's brutal murder at the hands of a stalker, an event that marks the end of her childhood and the beginning of her obsession with the stage. The Rise of the "Sun" by B-Komachi Unlike Aqua, who delves into the shadows to investigate crime, Ruby chooses the path of light. Her goal is to rebuild her mother's group, B-Komachi. For much of the story, Ruby is the optimistic driving force of the plot. She possesses a natural, almost divine charisma and boundless energy that masks the scars of her past. For her, shining as an idol is the only way to validate her existence and keep Ai's legacy alive. At this stage, her eyes sparkle with white stars, a symbol of pure ambition and unwavering hope for the future. The Fall into Darkness and the Redemption The most dramatic turn of events occurs when Ruby discovers the remains of Goro Amamiya (her doctor and first love in her past life). The realization that the tragedies in her life are connected breaks her emotionally. Her luck runs out, and Ruby transforms into a cold and manipulative figure. She begins to use people and exploit industry secrets to climb the ladder, driven by a deep-seated hatred. It wasn't until the filming of "15 Years of Lies" that Ruby achieved catharsis. Upon discovering that Aqua was Goro's reincarnation, the pieces of her soul finally fell into place. This revelation allowed her to forgive herself.

4. Catharsis and Reality Finally, during the filming of the movie "15 Years of Lies," Ruby is forced to portray Ai, confronting her mother's traumas and her own. The revelation that her brother Aqua is actually Goro's reincarnation marks a turning point. This reconciliation allows her to heal some of her wounds, regaining her sparkle but with a newfound maturity: she is no longer a copy of Ai, nor a blind avenger, but a fully realized artist who understands the weight of truth.