Well for viewing it yourself, all the pictures for the game are in the /graphics folder of the game in png format(for enemies like those you mentioned the subfolder /battlers would be the one to look in), for that alone(which would probably be better quality and resolution than a Screenshot I might give of the editor entry).
Also the editor is currently on sale on humble bundle for about €5
You must be registered to see the links
(all the RPGM editors does go on deep(the older the version the deeper the discount) semi-frequest sales on both steam and humble, WAY overpriced to buy them at full price).
To actually open the game in the editor, if you get it, you will need to first create a new empty project (you can delete it after again if you want). Once you have that new project go into its folder and find the Game.rvproj2 file, and copy that over ro the Naedoko Demons ground folder (the base folder where the game.exe is located) and that will be the "entry" point the editor uses to open the game. It is that easy yes to open a RPGM game in the respective editor (ofc game and editor version have to match or things will not work properly). Keep in mind if you do that as well, that even the translated game still have a LOT of internal names in japanese, like map names and such, that are not shown to the player. The only reason they have been in English in my Screenshot is due to the things I been doing with the game and how often I used it I went ahead and manually translated those myself at some point to make it easier to navigate it
