Jinbe is on an underwater adventure, where he comes across a lost sea kitten. He then brings the sea kitten to an ocean dog police officer, who leads the way back to her hometown. They then realize that the Kitten's hometown was gone. Jinbe saves a sinking ship and reads about Sea monsters attacking a port town, which he finds destroyed by remnants of the Sea Kitten's village. He then finds the culprit, who was Wadatsumi. After scolding Wadatsumi, the Sea Kitten's village is then returned to the sea and the port town is rebuilt. The next day Wadatsumi asks to join Jinbe, who agrees, and the two set off.
After depositing Caribou at the G-5 base, Jinbe journeys through the ocean. Many fish, sharks, sea turtles, jellyfish, squids, and other creatures follow after him, apparently happy to see him. Shortly afterwards, a baby sea cat comes up beside him, crying due to being lost. Some of the fish nearby appear sympathetic, and Jinbe looks on as the sea kitten looks to him for help. He then takes the sea kitten to a sea dog police officer who looks at them, seemingly puzzled. Shortly afterwards, however, he realizes that he lives in the same town as the sea kitten, and leads the way for Jinbe, smiling widely, and the sea kitten, who dries her tears as they follow him. However, the town appears to have completely disappeared which causes the sea kitten to start crying again.
During their search for evidence, the officer finds his house alone, which has been flipped sideways. Not long after that, the sea kitten and Jinbe discover a sinking ship nearby. Luckily, Jinbe manages to push it back up to the surface, much to the relief of the passengers on board. He then receives a newspaper from the grateful passengers and is promptly shocked when he reads the news of the Straw Hats and Heart Pirates alliance, and then is surprised again as he reads an article stating that various giant sea beasts were attacking a port town. He then decides to look around the port town from the newspaper.
Jinbe then discovers that the ruins that had destroyed the port town were in fact remnants of the sea kitten's town. The locals explained to him that monsters and ruins began to attack their ships and destroy their city respectively as offerings to them disappeared. Jinbe goes to see a large amount of offerings missing from their designated spot. Almost immediately after, both the sea dog officer and his home fall onto the ruins. Jinbe spots a shadow retreating back into the ocean and gives chase. Before long, he finds the offerings as well as the thief who turns out to be none other than Wadatsumi posing as a sea god.
The gigantic fishman reveals that he is the one responsible for the destruction towards the sea kitten's home town, believing the houses to belong to the humans who put up the offerings. Jinbe scolded Wadatsumi for his carelessness, and Wadatsumi and the sea monsters apologize to the Sea Kitten and the townsfolk. However, while inspecting the ruins, Jinbe is shocked to find a poneglyph. The ruins of the sea kitten's town are returned to the ocean via the harbor, and the rescued sailors wave goodbye to Jinbe and the citizens of the town as they sail away on the sea monsters' backs. That night a banquet is hosted, with Wadatsumi and the sea monsters in attendance. The following day, Wadatsumi asks Jinbe if he could go with him on his journey. Jinbe agrees, and with a new kimono for Jinbe and the poneglyph, the two set sail.
