The game revolves around Toru and his girlfriend Mari, who are suddenly drawn into a horrible murder mystery while on vacation at a skiing lodge. The first part of the games develops as a crime-solving adventure. Additional murders occur if the player is unable to find clues, and the story culminates into a horror movie-esque ending.

The two-hour drama version was produced by TBS, and is based on the Japanese sound novel developed and published by Chunsoft. Kamaitachi no Yoru 2 was set to be released on July 18 of the same year, and the first edition of the game contains a bonus DVD of the entire drama. Like the radio drama version, the TV drama is not a rendition of the actual game (the premise is that fans of Kamaitachi no Yoru had gathered to shoot a film based on the game, when one of the cast members is mysteriously killed). The drama does attempt to recreate the tense, mysterious atmosphere of the game.

Source: Wikipedia.org