Nice one, but how do you actually make the rain droplets visible (like in the attached pic) ? I have added <wrain: 5> to my map note and they are not visible. 
Hey man, sorry for not being clear about the instructions. You can use the native "Set Weather Effect" command in RPG Maker to create the rain; my plugin simply simulates the movement of water droplets falling on the surface. Using the native command doesn't incur significant processing costs, and it was the best way I found to integrate my plugin with the engine's existing features. Feel free to reach out if you have any questions.