Number 734 woke up on an isolated island and was told that he was a beneficiary of "memory reset therapy" and would start a new life here. However, the missing touch of the wedding ring on his ring finger, the broken fragments that flashed repeatedly in his mind, and the empty eyes of the "patients" around him all made him suspect that this seemingly perfect shelter was actually a carefully designed cage. He begins a secret search for the truth, trying to piece together the identity he has been stripped of. In this sea of oblivion, he must find the island of memory, otherwise he will sink forever and become a ghost without a past.
