A SINNER OF DEEP SEA TP (2025)

The ocean covers about 70% of the earth's surface-A whole world, yet unknown to humanity... And in its depths a nation, thousands of meters beneath the waves. There, the mermaid Jo has been whiling away her days in peace. But that tranquility is shattered when her friend Ryuu is locked away for breaking the gravest of undersea laws: That humans must never know of the world below.   But why would Ryuu let the secret slip? And who did she tell? The curtain rises on Jo's adventure to save her friend-and on her love..!??

Jo is willing to go to any length for Ryuu, even if the whole undersea society brands her a criminal for it. And Ryuu wants to see her beloved human again, so Jo will make it happen-but that means flopping out of the water and into the horrid world above the waves...

'Sinner Jo and boarder guard Akira make an unlikely team-but now their shared suspicion of lord Harujion's 'Mermaid Island Operation' has brought them together for a daring mission! Sneaking into lord Harujion's residence, they will risk it all to discover the truth of his wicket plans... Ryuu, who has let herself become a pawn in the lord's scemes; Jo, who leads the rebellion against him; and Yuki, the human who is tossed in the turbulent waters between them... Where will they all lay when this tsunami of a story crashes into its conclusion!?'