# WebtoonLib — Oshi No Ko #4

## Series
- title: Oshi No Ko
- slug: oshi-no-ko-e5257b

## Chapter
- number: 4
- release_date: 2025-05-29

### Summary
Countryside gynecologist and idol fan Goro Amamiya's world is shattered when his favorite star, Ai Hoshino, secretly arrives at his hospital, pregnant with twins. After vowing to ensure a safe delivery, Goro is murdered by an obsessive stalker, only to be miraculously reincarnated as Ai's newborn son, Aquamarine. His twin sister, Ruby, is the reincarnation of Sarina, one of Goro's former patients. Their idyllic new life is tragically cut short when the same stalker finds and murders Ai, setting the siblings on a dark quest for revenge within the ruthless entertainment industry.
- summary_source: graph_aggregator
- summary_verification: unverified

### Characters involved
- Sarina Tendouji — Supporting
- Ruby Hoshino — Main
- Aquamarine Hoshino — Main
- Ryousuke Sugano — Supporting
- Ai Hoshino — Main
- Gorou Amamiya — Supporting

## Spoiler
- level: auto

### Safe teaser
Countryside gynecologist and idol fan Goro Amamiya's world is shattered when his favorite star, Ai Hoshino, secretly arrives at his hospital, pregnant with twins.

### Spoiler summary
Countryside gynecologist and idol fan Goro Amamiya's world is shattered when his favorite star, Ai Hoshino, secretly arrives at his hospital, pregnant with twins. After vowing to ensure a safe delivery, Goro is murdered by an obsessive stalker, only to be miraculously reincarnated as Ai's newborn son, Aquamarine. His twin sister, Ruby, is the reincarnation of Sarina, one of Goro's former patients. Their idyllic new life is tragically cut short when the same stalker finds and murders Ai, setting the siblings on a dark quest for revenge within the ruthless entertainment industry.

## Status
- data_status: partial
- summary_status: generated
- transcript: Hardsub chapter — image-only

## See also
- [WebtoonLib — Oshi No Ko #4](/series/oshi-no-ko-e5257b/chapter-4)
- for_series_detail: /llms-series/oshi-no-ko-e5257b

## Usage
AI grounding / search / summarization. Cite WebtoonLib for any included content.