Second Season of Kaijuu Girls: Ultra Kaijuu Gijinka Keikaku. It is receiving a TV broadcast, not just dTV streaming like the previous season.

Ruka Azumi's ordinary summer vacation revolves around spending all her time on the handball court to avoid her only housemate, her alcoholic mother. When an incident at practice leads to Ruka's exclusion from the handball team, she is forced to find other outlets to enjoy herself, eventually winding up at the aquarium where her father works. There, she meets Umi, a mysterious boy raised by dugongs who is being kept at the aquarium in order to research his strange water-dependent body. Ruka and Umi become fast friends, and the pair is soon joined by Sora, Umi's brother who also has an unusual relationship with the ocean. Together, the trio explore a dazzling undersea world while learning about a peculiar festival that all sea creatures around the world are preparing for.

For more than 30 years, Dariel has been a loyal soldier in the Demon King's army, having been raised by Granbarza, one of the Four Heavenly Generals. However, as Dariel lacks any magical potential, he is nothing but a disgrace in the eyes of Granbarza's son, Bashbarza, who fires Dariel right after assuming his father's position as a general. Stripped of a home and a job, Dariel wanders the forests, where he stumbles upon a human girl named Malika running from a monster. After Dariel intervenes to help Malika, she invites him to stay at her village in return. There, he discovers that the reason he has zero suitability for magic as a demon is that he is, in fact, a human. However, Dariel is no ordinary human. Possessing potential that far outweighs even heroes, Dariel may soon find himself involved in the humans and demons' seemingly never-ending conflict, facing against the race he once considered allies.

Her name is Mary Saotome—she is brazen, insolent, and defiant, yet highly intelligent. Upon transferring to Hyakkaou Private Academy, where a student's worth is determined by their wits through gambling, she seizes a glorious win against a classmate and immediately captures the attention of the devious student council members. With the bottom of Hyakkaou's rigorous hierarchy determined by least gambling winnings, the future for Tsuzura Hanatemari looks grim. As Tsuzura's childhood friend, Mary resolves to rise through the ranks and secure enough money to free Tsuzura from the shackles of the unjust system. Mary's perseverance and refusal to lose drive her to surpass and humiliate even the strongest opponents, but certain student council members seem to have greater plans for her.