Shinshou Genmukan

Private detective Kido arrives on a mysterious island to solve a seemingly simple crime. The servant informs him that the family heirloom has been stolen by unknown persons, and it urgently needs to be found. Despite his doubts about the correctness of the decision to take on this case (everything seems too simple), Kido accepts the challenge.

Looking around the estate and its surroundings, he feels a surge of nostalgia for this place from time to time, but cannot understand why. After getting to know all the employees of the estate, he comes to the conclusion that only two of them could have committed such a fraud. But why haven't they left the island yet? What kind of strange feeling is he experiencing and what sounds are coming from the upper floors of the building?