一夜怪談 is a popular horror adventure game developed by NIGHTMARESTUDIO INC. It is the second title in the Nightmare Project series, following the success of "Distorted Alice" which gained popularity among high school girls through word-of-mouth.

In this game, players will experience a slightly humorous and slightly poignant one-night horror story. The game features improved graphics and sound quality, providing a realistic and immersive horror experience. However, it is important to note that the game is only available in Japanese.

The game follows the story of Yasuyuki Hagima, a young man living alone, who is suddenly haunted by supernatural phenomena for one night. Players will progress through the game by selecting commands such as "investigate," "think," and "move," leading to six different endings. Unlocking all the endings will reveal an extra story.

一夜怪談 is designed to create a sense of fear with its realistic sound effects and graphics. It will keep players on edge as they encounter various paranormal occurrences. If you enjoy a mix of laughter and sadness in a one-night horror story, this game is sure to provide an enjoyable experience.

Please note that the game is compatible with iPhone 4S and above, as well as iPad, iPod Touch, and requires iOS 7 or 8. Auto-save functionality is not available, and iPod Touch does not support vibration.