Life-Eating Ring Tokyo

2036. Japan disappeared from the map for eight years. Later generations called it: the Tokyo Catastrophe. A ring brought from the ruins of Tokyo is currently on my ring finger. It would suck the life out of me - day by day, bit by bit. I've tried taking it off, I've tried smashing it, I've tried cutting the finger off with a knife. All failed. It seems to be growing on me, no, it seems to be waiting for me. Wait until I come to Tokyo. Wait until I come to this dead city washed by the blood of androids. Wait for me to come to the unknown ancient tomb underground. The owner of the ancient tomb is Xu Fu. Later I learned that the ring was not a curse. It is an invitation. When will the cause of the disaster, the buried truth, and the answer I long for be revealed?