Fans of the Grand Blue anime series are eagerly awaiting the release of Season 4, and the main question is, “When will Grand Blue Season 4 be released?”
There has been no official announcement regarding the release of Grand Blue Season 4 on September 8, 2026. Therefore, anything announced as a release date for Season 4 is only a prediction, not an officially decided date.
When will Grand Blue Season 4 be released?
The most plausible prediction at the moment is that it is most likely to be released in 2028. Considering the typical anime production schedule, 2028-2029 seems like a fairly realistic timeframe.
our own schedule division looks like this:
- September-October 2026: Grand Blue Season 3 broadcast ends
- End of 2026 or 2027: Grand Blue Season 4 announcement expected
- 2027: Production information, promotional materials, cast information may be released
- 2028: Most likely release date if Season 4 is approved quickly
- 2029: Another option if production takes longer
There is no confirmed release date for Season 4, so 2028 is merely a prediction.
One reason why Season 3 won’t be released immediately after Season 4 is that Season 3 itself began airing in July 2026. The official announcement for Season 3 was made in March 2026, along with additional cast announcements.
Why 2028 is my best prediction?
The Grand Blue manga is still being updated and continues to produce new material. Recent reports indicate the manga will reach chapter 111 in August 2026, with chapter 112 scheduled for release by September 6th, and many more chapters planned. Popverse
This is great news for the next season of the anime, because there is still material. However, the producers need to determine if there is enough material to continue the anime and if the schedule allows it. If season 4 is announced shortly after season 3, a 2028 release would make more sense to me than a 2027 release.
What will the story of season 4 be?
The biggest advantage of Grand Blue is that there is enough manga material for the anime to continue. Season 3 has already introduced Iori, Chisa, Kōhei, and others to a new main setting. The official story of Season 3 focused on a trip to Palau, where Nanaka asked Iori to help out with a branch of the Palauan dolphin diving shop, Therefore, the story of Season 4 is expected to continue the arc of the manga.
While we will avoid revealing future manga events, viewers can look forward to:
- More adventures at university and in the diving club
- Iori getting involved in even stranger situations
- Development of Iori and Chisa’s relationship
- Romantic misunderstandings between the main characters
- Kōhei continues to be the source of the series’ absurdist humor
- Comedy related to diving stories and alcohol
- New characters may join the anime as the manga progresses.
And most importantly, Grand Blue will remain primarily a comedy and diving anime. No matter how much the romantic aspects develop, this series is unlikely to suddenly transform into a conventional romance anime.
Who are the cast members of Grand Blue Season 4?
If the next season is produced, the main voice cast will likely return.
The following characters are highly likely to return:
- Iori Kitahara
- Chisa Kotegawa
- Kōhei Imamura
- Nanaka Kotegawa
- Aina Yoshiwara
- Shinji Tokita
- Ryūjirō Kotobuki
- Members of the Diving Club
Season 3 added new characters and voice actors, including Sayaka Ohara (Sayaka Kotegawa), Asami Seto (Leader), and Aya Suzaki (Maki). Crunchyroll+1 Another interesting addition in Season 3 is M.A.O. (Carina). This is a German character related to Iori’s storyline. Crunchyroll Whether all the characters from Season 3 will appear in Season 4 depends on which material from the comic is used.
Fan Voices on Reddit
Discussions on Reddit show that fans still have a strong interest in the anime’s continuation.
When Season 3 was announced, the discussion on r/anime garnered thousands of votes, and fans quickly began discussing new characters and material for future storylines. Discussions about Season 3 episodes are also active. For example, the discussion about Season 3 Episode 1 garnered hundreds of votes, and discussions about subsequent episodes are also active.
This is not proof that Season 4 is confirmed, but it shows that the franchise still has a large online community. One recurring theme in fan discussions is the excitement of seeing more of the manga material adapted into anime, especially as Iori, Chisa, Aina, and Kōhei get caught up in more chaotic situations.
