Ruby Takes The Stage: How [Oshi no Ko] Season 3 Shifts The Revenge Focus To The Little Sister

For two seasons, we've watched Aqua Hoshino brood, scheme, and spiral deeper into his obsession with finding his mother's killer.

But Oshi no Ko Season 3 is pulling a narrative switch that manga readers have been waiting for: It's Ruby's turn now.

The Shift: From Aqua to Ruby

For the uninitiated, Ruby Hoshino has spent most of the anime being the "sunshine child." She's the idol, the cheerful one who still believes her "Sensei" (Dr. Goro, her past life) is out there somewhere.

Season 3 shatters that illusion... and ignites something darker.

Ruby discovers that Goro is dead—and worse, she connects his death to the same conspiracy that killed her mother, Ai.

Why Ruby's Revenge Hits Different

Aqua has always been calculating, almost cold in his pursuit. He's played the long game, manipulating people in the entertainment industry to get closer to his target.

Ruby? Ruby is angry. And she's not subtle about it.

Her investigation in Season 3 is less "strategic manipulation" and more "burning everything in her path until she finds the truth." It's a cathartic shift for readers who've been waiting to see the other Hoshino twin take the spotlight.

• Motivation: Aqua wants justice. Ruby wants vengeance.
• Method: Aqua operates in shadows. Ruby is about to kick down doors.
• Emotional Core: This is personal. Goro was the one person who saved her in her past life. This isn't about Ai anymore—it's about him.

What To Expect This Season

Without heavy spoilers, Season 3 will cover the "Movie Arc," which is the perfect stage for Ruby's evolution. While Aqua is focused on the production of a movie about Ai's life, Ruby is digging into the past.

Expect:

• Major revelations about Ai's murderer.
• Ruby confronting her past as "Sarina."
• A much darker tone compared to the idol-focused arcs of Season 2.

The Little Sister Is No Longer Little

Oshi no Ko Season 3 is shaping up to be the darkest chapter yet. And at its center is a young woman who's done waiting for her brother to do all the work.

Ruby Hoshino is taking the stage. And she's not here to sing.

!TIP Want to know more about Ruby? Check out her full character profile: Ruby Hoshino.