"REI THEME ENGINE" (aka WaifuClock) is one of the (Minimal/Japanese/Anime/Manga) -related Theme Engine. Which gives an art elegant experience to your Lockscreen. (this is an trail version of rei theme engine (premium)). ☁︎ Please note that it requires ROOT and LSPOSED to work properly. ☁︎ Custom roms running a12+ are supported. ☁︎ Latest oxygenos and realme UI is supported . ☁︎ Miui and stock roms are not supported.