Grand Blue Season 3 Reveals Key Visual and Opening Song Artist
The season's shift to Palau represents the franchise's first overseas setting, expanding the diving-focused comedy beyond its usual Japanese coastal town.
Reporting from 3 sources: Anime News Network, Anime Trending, Anime Corner.
The official website for the Grand Blue Dreaming anime revealed the key visual and opening theme song artist for the third season on May 24, timed to Japan's "Scuba Diving Day" (the date 5/24 can be read as "Go to Sea"). The band FUNKY MONKEY BΛBY'S performs the opening theme "Natsuko." The band announced the tie-in during the final stop of its 20th anniversary tour earlier that day. The season will premiere in July on Tokyo MX, BS11, MBS, and AT-X. The story moves to Palau, marking the first time the setting leaves Japan. Previously announced new cast members include Sayaka Ōhara as Sayaka Kotegawa, Asami Seto as Chief, and Aya Suzaki as Maki. The second season ended with its 12th episode in September 2025, and the entire season had leaked online in July 2025, with the final episode in the leak listing a third season. Shinji Takamatsu returns as director, scriptwriter, and sound director. Studios ZERO-G and Liber handle animation.
The band FUNKY MONKEY BΛBY'S announced the tie-in during the final stop of its 20th anniversary tour earlier on the same day. The key visual was released on May 24, a date Japan observes as "Scuba Diving Day" because the numbers 5, 2, and 4 can be read phonetically as "Go to Sea."
The returning voice cast includes Yuma Uchida as Iori Kitahara, Ryohei Kimura as Kohei Imamura, and Chika Anzai as Chisa Kotegawa, among others. Shinji Takamatsu returns as director, scriptwriter, and sound director. Hideoki Kusama handles character design alongside chief animation director Yoichi Ueda. Reiko Kasuga oversees art direction, and Yukari Hashimoto composes the music.
Kodansha USA Publishing releases the manga digitally in English. The manga launched in Kodansha's Good! Afternoon magazine in April 2014. The first anime season aired from July to September 2018, and a live-action film opened in Japan in August 2020. The story follows Iori Kitahara, who moves to a coastal town after high school and starts working at his uncle's diving shop, where he gets drawn into scuba diving and alcohol-fueled college life.
Synthesized by Yomimono from the 3 cited sources below, including Japanese-language reporting where cited, then editorially reviewed before publishing.