The Vanished Japanese Horror Mystery (2006) [Eng subs]

雨の 街 (English translation – Village of Rain) English title – The Vanished.
A young reporter is covering the mysterious case of a child found dead with missing internal organs. Suspecting a case of organ trafficking, he visits the doctor who was responsible for the autopsy; and finds that the organs were not stolen after all – they were missing from the start.  Tracing the body back to a remote area in the woods, he starts to unravel the story of a group of children who went missing 35 years ago… yet reappear every time it rains, seeming not to have aged a day since their disappearance… IMDB 5.5