The pirate captain named Nishimura Riki is sailing on his ship which he names 'black pearl' In the middle of looking for the whereabouts of a mermaid on the island of emptiness. He drifted ashore when his ship hit a rock, The crew began to make plans so that the mermaids would come to them. A mermaid came fiercely and brought her troops to attack the pirates , Then there was a mermaid who was caught, she was very beautiful, finally the mermaid was taken by pirates and put in a box filled with water. Ni-ki continued to watch her mermaid and was captivated by her pretty face. Someone had a rule that pirates were forbidden from falling in love with mermaids because it was very risky, It looks like this pirate captain is falling in love with a mermaid.