# WebtoonLib — One-Punch Man #1

## Series
- title: One-Punch Man
- slug: one-punch-man-4f9667

## Chapter
- number: 1
- release_date: 2025-05-29

### Summary
A powerful monster named Vaccine Man, born from Earth's pollution, appears with a mission to wipe out humanity. As he wreaks havoc, the unassuming hero Saitama arrives on the scene. Despite Vaccine Man's grand claims and destructive power, Saitama, facing an existential crisis from his own immense strength, ends the threat with a single, anticlimactic punch. A flashback reveals the origin of his heroic journey: a fateful encounter with the bizarre Crabrante, which inspired him to become a hero for fun.
- summary_source: graph_aggregator
- summary_verification: unverified

### Key events
- Saitama defeats Vaccine Man with a single punch, lamenting his lack of challenge.
- Saitama saves the Split-Chinned Kid from Crabrante, deciding to become a hero.

### Characters involved
- Split-Chinned Kid — Supporting
- Crabrante — Supporting
- Vaccine Man — Supporting
- Saitama — Main

## Spoiler
- level: auto

### Safe teaser
A powerful monster named Vaccine Man, born from Earth's pollution, appears with a mission to wipe out humanity.

### Spoiler summary
A powerful monster named Vaccine Man, born from Earth's pollution, appears with a mission to wipe out humanity. As he wreaks havoc, the unassuming hero Saitama arrives on the scene. Despite Vaccine Man's grand claims and destructive power, Saitama, facing an existential crisis from his own immense strength, ends the threat with a single, anticlimactic punch. A flashback reveals the origin of his heroic journey: a fateful encounter with the bizarre Crabrante, which inspired him to become a hero for fun.

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

## See also
- [WebtoonLib — One-Punch Man #1](/series/one-punch-man-4f9667/chapter-1)
- for_series_detail: /llms-series/one-punch-man-4f9667

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