The TV anime *[OSHI NO KO]*, which is scheduled to air its third season starting in January 2026, follows the story of Ruby and Aqua, the twin daughter and son of the legendary idol Hoshino Ai, as they navigate the entertainment industry.
In this article, we've compiled information about the character Hoshino Ruby. We've included everything from her profile and past life information to the tragic fate that awaits her in the latter half of the story.
※This article contains major spoilers for the story.
Hoshino Ruby (CV: Yurie Ikoma) Profile
Nickname: Ruby
Age: 16 years old (First-year high school student)
Agency: Strawberry Production
Height: 158cm
Family: Hoshino Ai (biological mother), Hoshino Aqua (biological older brother), Himekawa Taiki (half-brother)
Birthplace: Takachiho, Miyazaki Prefecture
Past Life: Tendouji Sarina
Ruby's Memories of Her Past Life
In her past life, she was Tendouji Sarina, a girl who suffered from a severe illness. Her reasons for living were her beloved idol, Hoshino Ai, and her attending physician, Amamiya Gorou.
After dying from her illness, she was reincarnated as the child of her idol Ai, becoming Ruby while retaining memories of her past life. She enjoyed a happy life being doted on by her beloved Ai. However, this peaceful existence came to an end when Ai was murdered, and afterwards, she was taken in and raised by Saitou Miyako, the wife of the company president.
After somehow coming to terms with her mother's death, Ruby, now a high school student, aspires to become an idol like Ai. She possesses her mother's perfect looks, beautiful blonde hair, and a distinctive star-shaped highlight that sparkles in her left eye. She's also skilled at dancing. With her energetic personality that somehow draws people in, she clearly has what it takes to be an idol.
Although other characters say her singing is catastrophically bad, having been unable to live a fulfilling life in her past life due to illness, she possesses a strong mentality that allows her to overcome any difficult trial while enjoying it.
The Relationship Between Ruby and Aqua, Both Reincarnated
Ruby and Aqua are both reincarnated individuals who had a special relationship in their past lives. Despite being aware that they both retained memories of their past lives, they didn't realize their connection to each other at the beginning of the story.
Living together as family, they exchange casual banter while maintaining a good relationship, clearly caring about each other. Aqua cares about Ruby as much as he's driven by revenge for his mother's murder, thoroughly investigating her school and idol agency, and keeping a watchful eye when she becomes active as the new "B-Komachi."
Ruby Discovers Gorou's Death
Ruby vaguely senses Gorou's presence in Aqua while working hard to become a top idol so she can reunite with Gorou, whom she believes is still alive.
Then, a bird and a mysterious girl appear before her.
The mysterious being reveals Gorou's death and the fact that the incident is deeply connected to the case involving her mother Ai.
Upon hearing this, both of Ruby's eyes glow black with the stars of revenge.
Fell into Darkness, The Story Accelerates
Having vowed revenge against the culprit who murdered Gorou and Ai, Ruby is no longer the bright and innocent idol she once was from the day she learned this truth. She resolves to ascend to the throne of top idol by any means necessary to achieve her revenge. Fans refer to this as her "fall to darkness," and she rapidly becomes famous, borrowing the power of those around her and utilizing her natural talent.
As her fame grows, various difficulties pile up. In the midst of all this, Aqua publicly reveals that he and Ruby are "Ai's children" in order to suppress a scandal involving Arima Kana. Ruby views this act as an insult to Ai and becomes furious. Their relationship also becomes distorted.
What kind of ending will Ruby and the others' story reach?
Ruby is Voiced by Yurie Ikoma!
Ruby is voiced by voice actress Yurie Ikoma!
Born on February 24th in Tokyo, Ikoma has appeared in Duel Masters King MAX, Shikimori's Not Just a Cutie, Megaton Musashi, and more, perfectly portraying this important character in this work.
[OSHI NO KO] Work Overview
Synopsis
“In this world (of entertainment), lies are a weapon.”
Gorou is an obstetrician working in a local city.
One day, his favorite idol, Ai of "B-Komachi," appears before him.
She harbors a certain forbidden secret…
From this "worst" encounter between the two, fate begins to stir—
Cast
Ai: Rie Takahashi
Aqua: Takeo Otsuka
Ruby: Yurie Ikoma
Gorou: Kent Ito
Sarina: Tomoe Takayanagi
Aqua (childhood): Yumi Uchiyama
Arima Kana: Megumi Han
Kurokawa Akane: Manaka Ishimi
MEMcho: Rumi Okubo
(C) Aka Akasaka x Mengo Yokoyari / Shueisha・[OSHI NO KO] Production Committee
© Animate Times
*Some parts of this text have been translated using machine translation
