Episode 378: Promise on a Day Long Ago - The Pirate's Song and a Tiny Whale
One Piece Episode 378 „Promise on a Day Long Ago - The Pirate's Song and a Tiny Whale“. Adapts chapter 486. First aired: 2008-11-23.
- Read on in the manga from: Chapter 487 (Volume 50 – Arriving Again)
- Title (Japanese): 遠い日の約束 海賊の唄と小さなクジラ
- Title (romaji): Tōi Hi no Yakusoku - Kaizoku no Uta to Chīsana Kujira
- First aired (Japanese): 2008-11-23
- First aired (German): 2010-02-03
- Category: Story
- Arc: Thriller Bark Arc
- Chapter adapted: Chapters 486