Finally, since one week after I release windows 7 theme of Re Zero, today I share the windows 8.1 or 10 version. With a few changes, I assure you that this theme is not much different from windows 7 version.
Quite difficult to combine it with some Rainmeter. You can try some Rainmeter to create the look you want. I'm using Rota HUD by Extra Cycle and Mark III by Xune531.