If you speak with the Slime Key Crafter NPC on Slime Island, he will ask you to collect 7 different Slimes spread across various islands. While certain Slime locations, like the one on Starter Island, are easy to find, others require intensive searching. Here is a complete guide listing all the Slime Locations and the fastest way to reach them.
How to find all 7 Slimes in Sailor Piece
Below, you can find all seven Slime locations in Sailor Piece. Each of these is on a different island, and you must use the teleporter to travel to each of the islands and collect the Slimes.
Slime Location 1 - Desert Island

For the next one, you have to go to the Desert Island using the teleporter. Here, you have to go towards the left side to find a large dinosaur bone fossil. Just go underneath it to find the Slime.
Slime Location 2 - Snow Island

Inside the Snow Island, you will find a cottage at the center of the island with the Artifacts Master NPC in front of it. Right behind this NPC, you will find a small ledge and a tree at the edge. Look behind this tree to find the Slime.
Slime Location 3 - Starter Island

The first Slime is located on a tree branch next to the house at the center of the island. Walk northeast from the teleporter to find the house and the tree next to it.
Slime Location 4 - Jungle Island

After teleporting inside the Jungle Island, you can find a big wooden watch tower on the right side of the map. Triple jump and reach the top part of the watch tower to find a Slime at the top.
Slime Location 5 - Shibuya Station

This is a bit tricky to find as it's located very deep inside the Shibuya Station. Use the teleporter to reach the island. Now, walk straight down the main road to reach the other end of the map and the roadway. On the right side, you will find a building with a Slime near the glass panel.
Slime Location 6 - Hueco Mondo

This one is inside Hueco Mondo island. Here on the left, you will find two large open cooling towers for the factory. Go near these towers to find a Slime hidden in the center of them.
Slime Location 7 - Shinjuku Island

The final Slime is located on the Shinjuku Island. After spawning inside the world, walk towards the left side to find two broken buildings on the verge of falling into each other. Go through the small opening between these buildings to reach the other side of the map. On the left side, you will find a weirdly shaped tree, as shown in the above image. Go near it to find a Slime on top.
Sailor Piece Slime FAQs
The Slime Key Crafter NPC is located inside Slime Island. After teleporting, walk towards the center of the town to find the NPC standing in front of a small building.
The Slime is a transparent, blue, shiny blob with a smile on its face. Just walk up to it and press the interaction button to collect the item.
Players must collect seven different Slimes all across the map in Sailor Piece to access the Slime Crafter.
For more on Sailor Piece, check out How to Get All Weapons in Sailor Piece or All Sailor Piece Dungeon Piece Locations