Black Postman

This film tells the story of a "very ordinary postman" who faces his past and becomes a "dark hero" who fights against invisible enemies. The official synopsis of the story is "There was once a mailbox for children who were tortured by adults. As long as you put it in, the "Devil of Neverland" would appear in the mysterious mailbox to punish the bad adults. But the "devil" suddenly disappeared due to a certain incident. Ten years after that, Soejima Rikiya, a former postman who worked at a hospice, got a mysterious letter. It said "Dream" "The Devil of Fantasy Island is not over yet". He took this as an opportunity to resume his job locally. The reason why Rikiya returned to the post office was...! At this moment, "The Devil of Neverland" had a new development. A strangled corpse was found by the river, and a piece of paper with the words "The Devil of Neverland Returns" was found from the mouth of the corpse. Now 10 years later? Who is it? Why? Then Riki also happened in the town...