In the world they exist, the curses. People who perished in the worst ways posible in their former lives see themselves becoming these curses. Curses don't remember anything about their former lives and they invade the first human they see. The human, invaded by the curse will now have to fulfill two things. The obligation of the curse and the punishment of the curse.

The punishment of the curse can vary depending on the obligation.

The obligation is the request the curse makes for their shelter-body so that this person won't recieve the punishment.

But there is a way to escape this obligation-punishment kind of live. The wish of the curse. The only way to make a curse finally die is by fulfilling its wish. The wish is something not even the curse knows, and the invaded person will need to guess that wish. This wish will be the most strongest desire they had in their former lives before perishing.

Our protagonist is able to relate himself with curses, meaning he can communicate with them, something others can't. What is he hiding from the others?