# WebtoonLib — One Piece #651

## Series
- title: One Piece
- slug: one-piece-46bb51

## Chapter
- number: 651
- release_date: 2025-05-29

### Summary
As the battle for Fish-Man Island reaches a fever pitch, the royal family's true might is unleashed, with King Neptune and his sons proving to be formidable "Neptunians" fighting to protect their kingdom. While the physical conflict rages, Nico Robin uncovers a secret of world-shattering importance from an ancient Poneglyph: a long-lost promise from the mysterious figure Joy Boy, and the name of the third Ancient Weapon, Uranus. The fight is no longer just for the island's freedom, but for a legacy tied to the very history of the world.
- summary_source: graph_aggregator
- summary_verification: unverified

### Characters involved
- Neptune — Supporting

## Spoiler
- level: auto

### Safe teaser
As the battle for Fish-Man Island reaches a fever pitch, the royal family's true might is unleashed, with King Neptune and his sons proving to be formidable "Neptunians" fighting to protect their kingdom.

### Spoiler summary
As the battle for Fish-Man Island reaches a fever pitch, the royal family's true might is unleashed, with King Neptune and his sons proving to be formidable "Neptunians" fighting to protect their kingdom. While the physical conflict rages, Nico Robin uncovers a secret of world-shattering importance from an ancient Poneglyph: a long-lost promise from the mysterious figure Joy Boy, and the name of the third Ancient Weapon, Uranus. The fight is no longer just for the island's freedom, but for a legacy tied to the very history of the world.

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

## See also
- [WebtoonLib — One Piece #651](/series/one-piece-46bb51/chapter-651)
- for_series_detail: /llms-series/one-piece-46bb51

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