With the exception of just a few, all decals are based on photographs taken in Tokyo area. Each decal is translated into English (note: some decals are extremely large, so the translation gives a summary of the contents to assure correct context application). There are 7 folders in total, including color decals, white and yellow background decals, and 4 folders of transparent background decals.
Decal Machine installation: simply donwload, unpack folders, and copy them into Decal Machine asset library: C:\Users\YOURPCNAME\AppData\Roaming\Blender Foundation\Blender\2.81(or other blender version)\scripts\addons\DECALmachine\assets\Decals
Xrtite color passport color correction to ensure authentic colors.
English transaltions included.