A kind senior showed me a channel that explains how to use ray-mmd and Skybox.
Channel Name : The Weeb Dev【MMD】

I tried tweaking the motion a bit to match the model and stage.
I gave up on adjusting the part where the arms cross...
People who can make motions from scratch are really amazing, after all.

USE↓
model:mei Evelyn
stage:つねかわ HaloweenTownStage
motion:IA_HIGHER_Motion
camera:鏡/きょう HIGHER カメラモーション
effects:AutoLuminous,ray-mmd,DOF,ExcellentShadow