Hazama no Tsuki

Atop a forbidding hill surrounded by mysterious forests and decrepit paths lies a lonely residence. It is to this very estate that a young man has been summoned by its beautiful owner, asking him to fulfill an altruistic desire. Yet the circumstances of his visit are far from normal, and the three occupants who he encounters are more than what they seem. Evil broods strongly where he is traveling, and its hunger will only grow with his presence, stealing everything he treasures from the past, and forever corrupting his future.

[From an old review by Nargrakhan]