There is a "book contract system" hidden under the real world. The blank book (deed book) is the carrier of "obsession materialization". Each contract corresponds to the unfulfilled wish of an "obsessionist". It does not exist naturally, but is generated by the holder's ultimate obsession. Those who hold the deed will be pulled into the "deed fantasy". The fantasy is based on the holder's "regretful memory scene" and triggers a countdown to death. Only by complying with the rules given in the deed and completing the "obsession closed loop" can one escape from the fantasy and survive.
