Oshi no Ko — Story Arcs & Filler Guide
Episode ranges, plot summaries, and frequently asked questions for every major arc in Oshi no Ko. Updated 2026.
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Ai's Murder & Reincarnation
Eps 1–11 · 11 epsWhat is the premise of Oshi no Ko?
A country doctor who idolizes rising star Ai Hoshino ends up delivering her secretly-conceived twins — and is murdered on the same night as Ai's own death, reincarnating as her son Aqua alongside his patient as her daughter Ruby.
Does Ai Hoshino die in Oshi no Ko?
Yes. Ai is murdered by a stalker early in the story — a pivotal tragedy that drives her children Aqua and Ruby's quest to uncover the truth and find her killer.
Entertainment Industry Arc
Eps 12–35 · 24 epsWhat does Aqua do after Ai's death?
Aqua enters the entertainment industry as an actor, using his position to investigate the identity of Ai's killer and the circumstances surrounding her murder.
What does Ruby do after Ai's death?
Ruby grows up determined to become an idol like her late mother, eventually forming and leading the idol group B-Komachi.