: Despite his obsession with anime idols, Kouhei continues to provide a comedic foil to Iori, alternating between being his "true bro" and his biggest hater, such as when he is eager to call the police on Iori's public antics.
In , Episode 11 serves as a critical bridge toward the season finale, focusing on Iori's struggle with his diving license and the deepening of character relationships. Episode Summary: "Vicious Circle" Grand Blue Episode 11
: A significant subplot involves Aina Yoshiwara , who mistakenly believes Iori and Chisa are engaged in "shady" activities when she catches them practicing together in private. This leads to a classic Grand Blue misunderstanding involving Aina, Chisa, and Iori that eventually results in physical comedy. : Despite his obsession with anime idols, Kouhei
: The bond between the two cousins (by marriage) grows as Chisa takes on a mentor role. While Iori is often a degenerate, his genuine appreciation for Chisa's help and his dedication to the license test show a rare serious side. This leads to a classic Grand Blue misunderstanding