This news is slightly late, but ONE PIECE FAN LETTER is available to stream, in Japanese with English subtitles, on Netflix in the UK.
ONE PIECE FAN LETTER originally simulcast streamed on Crunchyroll, with the episode being added to the platform on 20th October 2024, but as with other new ONE PIECE episodes it was then added to Netflix nearly a week later on 26th October 2024. This special episode was also screened at EGX x MCM Comic Con this past weekend on 27th October 2024.
Synopsis: The “ONE PIECE FAN LETTER”, a production commemorating the 25th anniversary of the anime ONE PIECE which is based on “ONE PIECE Novel Straw Hat Stories” by Tomohito Ohsaki, for which the script has been written by Momoka Toyoda, and the director and character design/animation director were Megumi Ishitani and Keisuke Mori.
ONE PIECE FAN LETTER is available to stream on both Netflix and Crunchyroll in the UK, in Japanese with English subtitles.