Where to continue the Grand Blue Dreaming manga

Grand Blue Dreaming by Kenji Inoue & Kimitake Yoshioka, 2014. The manga is still ongoing.

• Season 1 (12 episodes): Continue the manga from chapter 22 in volume 6.
• Season 2 (12 episodes): Continue the manga from chapter 46 in volume 12. The anime skips volume 6 (chapters 22 to 25) between seasons, so read it before continuing if you want everything.

Read the manga: Kodansha.