Abyss Azure Volume 3

In order to escape Erigeron's grip, Jo asks the mermaid police to arrest him. So she is locked in a cage for a while. But the commissioner, doubting the politician's good intentions, takes our heroine with her to the castle as a spy to find out what he is up to. Jo, for her part, is determined to find her friends Ryû and Yuki and free them from the influence of Lord Erigeron. She manages as best she can to find them, but she is not at the end of her surprises, because she discovers the latter's true objective: to create half-human, half-mermaid hybrid children and use their powers to seize of the sea...