Try uninstalling the apk then reinstall it again, if that doesn’t work, check if your storage is full and try to delete some things. It always happens to me too.
I just did it on my computer, I wasn't home at the time of trying to read it so I was trying to get it on my phone. No VN's work on my phone for some reason anymore sadly idk why. Also Love your pfp I also got started on that VN and I'm hooked!
