: "Cakey" (Aina Yoshiwara) is officially introduced as the blue-haired girl from the opening credits, becoming a permanent part of the main group. Viewer Reception
: Fans widely consider this one of the funniest episodes due to the "betrayal" among the male friends and the "scumbros" dynamic.
: Iori’s friend group, including the desperate Kohei, attempts to participate in a social mixer. The comedy peaks as the boys' "comradeship" turns into mutual destruction once they realize their romantic goals are failing. Grand Blue Episode 5
Episode 5 of (titled "Too Late") is a turning point that shifts the focus from club activities to the chaotic "college life" social dynamics of Iori and his friends . Episode Overview
: This episode highlights Chisa’s contrasting personality—being "cute and innocent" at school while appearing utterly heartless toward Iori at home. : "Cakey" (Aina Yoshiwara) is officially introduced as
: Azusa takes it upon herself to act as a "wing-woman" for Chisa, though her methods—which involve forcing Iori to play her boyfriend to see Chisa's reaction—mostly just cause more trouble.
: Some viewers found it slightly weaker than the scuba-focused episodes because it leans heavily into drinking games and standard "ecchi" comedy rather than diving. Season 2 Update The comedy peaks as the boys' "comradeship" turns
While the first season (12 episodes) covered these events, a was released in July 2025. Season 2 Episode 5 specifically features a storyline involving the male characters dressed as maids to distract customers, continuing the series' trend of gender-bending humor.