Fish-men Island has been on One Piece as one of the famous spots in Grand Line since long time ago, but the Straw Hat pirates didn’t get there easily. Finally, they made it in this volume, and you can see the world of Fish-men, mermaid and merman. You can see a lot of beautiful mermaids relaxing on the inlet with corals, water roads and fishes. It’s like a scene out of a fairy tale!!! And its detailed setting makes the world much more interesting, how they live, how their life platform’s set, what kind of problem they have now…and so on. Besides those creatures, other legendary ones like Kuraken and sea spirit(Wadatsumi-the name’s derived from Japanese sea god) take you to the adventures of the underwater, and the thing I want you read and feel is that Luffy’s really enjoying with it even if other crews are being scared of. I can say that in this volume, you can know the fact “LUFFY IS BACK!!!”. Sanji have a problem with his naughty thought, and he looks really funny with it. Though what Sanji did makes us fun, but it has to do with the theme of Fish-men arc in a sense, so you might realize it’s not just funny while you read it.
In the second half, main characters of this arc appear one after another. King Neptune, his three sons, Neptune Brothers and mermaid princess, Shirahoshi as the royal family of Ryugu Kingdom. They invite the Straw Hat pirates for a banquet in return for saving Shirahoshi’s dearest friend, Megalo, but it doesn’t go easily. Fortune teller, Madam Sharley foresees the pirate with the straw will bring ruin to Fish-Men Island. At Noah, Fish-man District, something sinister is going on. Two captains of New Fish-Man Pirates, Hody Jones and Flying Pirates, Vander Decken '\ shake hands with a FISHY SMILE. Now you and Luffy’s adventure on Fish-Man Island’s started!!