Grand Blue Dreaming Season 3 Episode 4 Story & Preview Cuts Released: Chisa's Mother Sayaka Appears Before Iori and the Group
The story and preview images for Episode 4 of the TV anime Grand Blue Dreaming (JP: ぐらんぶる) Season 3 have been revealed. This episode will air on Tuesday, July 28 at 12:00 AM (JST), and will later be available on various international streaming platforms.

from Grand Blue Dreaming Season 3 (C) Kenji Inoue, Kimitake Yoshioka, Kodansha / Grand Blue Dreaming 3 Production Committee
Episode 4 Story
Iori and his friends are finally heading to Palau. They plan to spend the rest of their summer vacation working part-time at the Palau branch of "Dolphin." However, waiting for them at the airport is none other than Kebako... Aina! Why is she here when she had left to help out with her family's business? After an unexpected reunion, their life in Palau begins as they balance work while staying in a dormitory. As they enjoy a tropical night drinking as usual, Chisa's mother, Sayaka, appears before them.

from Grand Blue Dreaming Season 3 (C) Kenji Inoue, Kimitake Yoshioka, Kodansha / Grand Blue Dreaming 3 Production Committee
Introduction

(C) Kenji Inoue, Kimitake Yoshioka, Kodansha / Grand Blue Dreaming 3 Production Committee
This time, it's Grand Blue Dreaming in Palau!
It has been a few months since Iori Kitahara began his university life in Izu—. At "Grand Blue," the diving shop where he is staying, he lives under the same roof as his cute cousin, Chisa Kotegawa. Joining them are his older cousin Nanaka Kotegawa, the irresistibly mature and sexy Azusa Hamaoka, and his classmate Aina Yoshiwara. On the surface, he was enjoying a smooth-sailing, youthful campus life!
...But that's only one side of the story. In reality, the vast majority of his university life is a frantic frenzy surrounded by stark-naked guys! This is because "Peek a Boo," the diving club Iori joined, treats diving as a sideshow, making a daily routine out of buff men stripping completely naked to down drinks and cause a ruckus. Alongside Kohei Imamura—a good-looking guy who happens to be a hardcore otaku—Iori has become thoroughly corrupted by the club.
Amidst all this, Nanaka asks Iori for a favor: the diving shop "Dolphin" has opened a branch in Palau, and since they are short-handed, she wants him to come over and help out. However, Iori remembers that Kohei strictly refused to go abroad because he wouldn't be able to watch his anime in real-time...
This summer, their very first overseas "Grand Blue" life kicks off in Palau!
Source : Grand Blue Dreaming Official