Fans of the Grand Blue anime series can anticipate more adventures, as Grand Blue Season 4 has been officially announced. The announcement came directly after the third season's finale concluded its broadcast in Japan. This swift reveal indicates a continued commitment to adapting the popular manga series.

The announcement was accompanied by a new teaser visual. This visual features characters Chisa Kotegawa, Aina Yoshiwara, and Sakurako Busujima depicted in swimsuits. A photograph of Iori, pierced by a knife, is also part of the visual, hinting at a new romantic rivalry, a theme that was also present in the final episode of Season 3.

Returning Staff and Production

Shinji Takamatsu is set to return as the director for Grand Blue Season 4. The animation will once again be handled by studios ZERO-G and Liber. Takamatsu also directed Season 3, which aired from July 6 to September 21, 2026. The previous season saw Hideoki Kusama managing character design, with Yoichi Ueda as chief animation director. Reiko Kasuga oversaw art direction, and Yukari Hashimoto composed the music. The announcement does not specify if these additional staff members will return for Season 4, but Takamatsu's return suggests continuity in the production team.

Series Background

Grand Blue Dreaming, commonly known as Grand Blue, is a manga series created by writer Kenji Inoue and illustrator Kimitake Yoshioka. It began serialization in Kodansha's Good! Afternoon magazine in April 2014. The story centers on Iori Kitahara, who moves to a coastal town after high school to work at his uncle's diving shop. His new life quickly involves him in both scuba diving and the chaotic, alcohol-fueled college experience, leading to various friendships and humorous situations. Kodansha also publishes the manga in English.

Key points

  • Grand Blue Season 4 officially announced.
  • Announcement made immediately after Season 3 finale aired in Japan.
  • New teaser visual released featuring Chisa, Aina, Sakurako, and a hint of romantic rivalry.
  • Shinji Takamatsu returns as director for Season 4.
  • Studios ZERO-G and Liber will handle animation for Season 4.

Source: Anime Corner · Sep 21, 2026