Where to get this case:
At the Start of Chapter 6 a little girl is standing in front of the school looking at a squirrel graffiti.
General Advice for Squirrels:
Finish the School Stories
As reward, you get the Paint Seekers Machine.
Equip it as Accessory Gear in your Items Menu.
Then, as soon as a squirrel is near on the map, you hear a beeping sound and see a yellow squirrel item on the map.
Now they're easier to find...
Examine the Squirrel.
Then, take out the AMP and listen to where the sound is coming from.
Examine the area.
More squirrels will be added here if found.
... use the Detector to find the treasure. It's behind the pillow on the couch at the back of this screenshot.
At the entrance to Yokohama 99. Use the DETECTOR to follow it to a green bush south of the entrance. As displayed here on the map.
...yet another squirrel pointing to the top of one of the bridge lamps. Use your drone to get the reward.
This Squirrel is on the same road as Yokohama 99 but in the south. Take out the AMP and listen towards the sound. The next Squirrel is...