Apparently three packages are missing:

webkit2gtk-4.1 - a hard dependency, errors out with error while loading shared libraries: libwebkit2gtk-4.1.so.0: cannot open shared object file: No such file or directory
xdg-user-dirs - required for accessing the user's home directory (creates a Mangayomi folder in your home directory). You'll get this cryptic error on flutter (see #137)
mpv - hard dependency since it contains libmpv, errors out with error while loading shared libraries: libmpv.so.1: cannot open shared object file: No such file or directory

the newer that I can reference is issue #399, also via Arch linux

(I made a comment on the AUR under the username infinitydoki25 with mostly the same message.

hey, sorry for late reply, and for issues you faced too, currently, the aur website is not working for some reason,however, i forget to add those dependencies since they were already installed on my machine, is the aur website working for you now?, it's not working for me

I can log into the AUR as of 16:00 PHT.

the issue with the aur package fixed, thanks again for report and sorry for late reply, i was really busy the previous 3 days😅