Lol, I’ve translated both songs earlier than the PV was released. Current status of the PV is “pending”, which means they won’t even make any more statements about when it will be released. Will it ever be finished? I don’t think so…!
The machine mourns after the death of the human it loved. Being immortal as a machine and all, it can’t follow its beloved one to the afterworld. The first half of the song is told by the youkai, which was the human originally, the second half by the machine. In the end, the machine shuts itself down until the day the human is reborn. Or something.