Once there was a mailbox that was for children who suffered from adults. When children, who suffered from adults, placed a letter in the mailbox, Neverland Devil punished the bad adults. Due to a case, Neverland Devil suddenly disappeared. 10 years from the disappearance, Rikiya Soejima (Kei Tanaka) is a former mailman who now works at a hospice hospital. One day, he receives a mysterious letter. The letters states "Neverland Devil isn’t over." Rikiya Soejima quits his job at the hospice and goes back to his mailman position at the post office. Around that time, a dead body, that was strangled to death, is found in the riverbank. A piece of paper is found in the mouth of the deceased person. The piece of paper states that "Neverland Devil’s comeback." Rikiya Soejima becomes involved with the serial murder case of Neverland Devil.