The official website for the Grand Blue Dreaming anime announced season 4 right after the season 3 finale aired in Japan on September 21, 2026.
Season 3 Ends In Palau
Season 3 aired from July 6, 2026 on Tokyo MX and BS11 across 12 episodes, and was the first time the series moved outside Japan, with the cast traveling to Palau. The anime is produced by ZERO-G and Liber, directed by Shinji Takamatsu.
Season 4 Teaser Visual
The new visual features Chisa Kotegawa, Aina Yoshiwara and Sakurako Busujima in swimsuits, along with a photograph of Iori pierced by a knife, teasing the new romantic rivalry set up in the season 3 finale. The announcement gave no release window or production changes.
About The Source
Grand Blue Dreaming is a manga by Kenji Inoue and Kimitake Yoshioka, serialized in Kodansha's Good! Afternoon magazine since April 2014, about diving and the shenanigans of college freshmen. The anime first aired in July 2018, and a live-action film followed in August 2020.
Sources: Anime News Network, Anime Corner.