The game takes place at a mansion on the hills, which is sometimes refereed to as a castle depending on the version of the game. The player controls a police officer who was sent to investigate after the local police precinct who received an emergency call (or "SOS signal" in some versions) from there.
After searching around the mansion, the player character is able to unlock a corridor where a licker is fought as the final boss. After defeating the licker, there are four possible endings with the protagonist rescuing a survivor of the incident. The survivor can be a dog, an adult man, a crying woman, or a pair of children.
The game operates as a First Person Shooter, and features the player roaming around the building shooting at zombies and crows. To refil ammo and health, the player must shoot green herbs and ammo packs which appear floating on the screen from times to times. The weapons available were the handguns, a shotgun, a submachine gun, and even a grenade launcher.
- Official webpage(Japanese)