Umigame

Mukoujima Takurou is a lonely teenager who spends his time fishing at the pier and, to his incredible surprise, fishes up Muromi, a mermaid. Muromi first off doesn't realize she's a mermaid until she meets Takurou. Not only that, she is incredibly dense and crazy and has a drinking problem to top it off. Now every time Takurou goes fishing, Muromi appears and makes life…

Seiran Island, the tropical remote island, is home to Tachibana Junnosuke and his young sister, Asane, who return here from the mainland as a result of their parents' death. However, Seiran Island has become a dystopia where, to stop the decline of population, authorities have enforced the "Pervert Law." Sex is permitted and encouraged anywhere on the island, and those who…