One Pace — Fishman Island 18

One Pace Fishman Island episode 18 ("I'll Protect Everything") covers manga chapters 638–639.

I'll Protect Everything

One Pace

Fishman Island 18I'll Protect Everything

Manga chapters

Chapter 638
Chapter 639

Source anime episodes

Episode 559
Episode 560

What One Pace is

One Pace is a fan project that re-edits the Toei anime to match the manga's pacing. It cuts filler, recaps, and stretched scenes, so a single One Pace episode usually covers the same ground as several broadcast episodes — here, chapters 638–639 re-cut from anime episodes 559–560.