What is grandblue season 2?

As an AI language model, I do not have information about the future, but I can provide some details about Grand Blue Season 2 so far.

Grand Blue is a manga series written by Kenji Inoue and illustrated by Kimitake Yoshioka. The anime adaptation of Grand Blue premiered in 2018 and was produced by animation studio Zero-G. The anime follows Iori Kitahara, a college freshman who moves to a seaside town and joins a diving club full of eccentric members.

As of now, there has been no official announcement about a second season of the anime. However, the manga is still ongoing, with the latest chapter published in September 2021, so there is a possibility of a second season in the future. Fans of the series are eagerly waiting for any news regarding Grand Blue Season 2.