Fischer's x One Piece - Search for the 7 Treasures

Fischer's x One Piece - Search for the 7 Treasures is a spin-off One Piece manga that was written and drawn by Semimaro Aburakouji. It has been published in the bi-monthly Saikyō Jump since August 3rd, 2018, and is currently ongoing. Its first physical volume was published in July 2019.

Premise
The premise of this manga is about the Youtube group Fischer's being transported into the world of One Piece.

Fischer's Pirates

 * Silk
 * Dama
 * Zakao
 * Ndaho
 * Motoki
 * Masai
 * Peketan
 * Lip Shark

Other Characters

 * Mr. Kuromaku

Chapters not yet published in volume format
The following chapters have appeared in Saikyō Jump but have yet to be reprinted in tankōbon format.
 * One Piece Magazine Vol.6 - Preview Chapter
 * The Fischer's crew present rare One Piece items to a panel of former One Piece editors, attempting to have the most valuable collectible.
 * 017. Trying to be a Fish-Man!? Rampage at the Undersea Sports Festival!! (魚人になってみた!?海底大運動会で大暴れ!!)
 * 018. A Challenge from Master ~Escape!! Punk Hazard~ (からの挑戦状〜脱出せよ！！パンクハザード〜)
 * 019. Where Are We!? The Mysterious Carvador Island!! (ここはどこ!? 謎のカーバドル島!!)
 * 020. A Fierce Battle!! The Carvador Island Card Tournament! (激闘!! カーバドル島カード大会!)
 * 021. A Close Look at Life on Board!? A Day at Fischer's!! (船上生活に密着!? Fischer'sの一日!!)

Publication History
The series began publication in the Saikyo Jump 2018 September issue. It was absent from the 2021 January issue, likely due to controversy surrounding the Fischer's member Peketan. It resumed publication in the following 2021 March issue, but after the May issue the Saikyo Jump magazine itself went on hiatus to prepare for its relaunch in a monthly schedule.

On May 30, 2021, the series began to be published in video comic format on the Saikyo Jump YouTube channel. When the magazine returned with its 2021 September issue, the series was absent. Instead, Chapter 17 debuted on the YouTube channel, being released in five parts during August 2021. After this, older chapters continued to be published in video comic format, until Chapter 18 began to be released in May 2022. However, it was initially left incomplete after three parts, with it only completing 10 months later.

The series returned to the Saikyo Jump magazine in the 2023 April issue with Chapter 19, but returned to a hiatus after the following issue. On November 18, 2023, the video versions of the existing 20 chapters were streamed on YouTube, culminating in the release of Chapter 21 in two parts.

Trivia

 * This is the only spin-off series to introduce new Devil Fruits, being the Peke Peke no Mi, Gemu Gemu no Mi, and Kyara Kyara no Mi.
 * Peketan has been removed from Chapters 16 onward, likely due to his removal from Fischer's. The removal is not explained in the series; they simply don't mention him.
 * He's implied to be present in Chapter 16, with a 7th person being visible behind text boxes, but is completely absent from later chapters.

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Fischer's x One Piece - 7-tsunagi no Daihihou