Players are tasked with navigating their character through city streets, while avoiding the vampire enemies that patrol the streets disguised as ordinary human citizens. Vampire Rain is a stealth game similar in nature to the Splinter Cell or Metal Gear series. If one chose not to kill him the lamenting leader vacates the premises only for the little girl to appear beside him and they walk off together. She pours blood onto the ashes of the leader, and he is resurrected. The second doesn't resist and offers the player the choice to kill him or not, claiming that the future of the nightwalker race will soon be revealed.ДЄfter the player has left the final battle, if he chose to end him the haunting young girl appears.

It turns out the head vampire wasn't really the true leader of nightwalkers in the city, as he was advised by two nightwalkers who were naturally born as vampires and can survive in the daytime. The player is forced to fight and defeat him. Unfortunately, the leader also wants full-scale war against the humans, and plans to change the whole city into nightwalkers. The player defeats all the hybrids and vampires in their way, eventually meeting with the leader of the vampires in an attempt to keep the peace. They send their own human/nightwalker hybrids to kill the player's group to get rid of the evidence, and send the rest of their forces against the Nightwalkers' headquarters in the city. Later on it is revealed that the AIB, acting of their own accord, plan for America to enter full-scale war against the Nightwalkers. Eventually the player finds out that his team leader has also seen her. Throughout the game the player is haunted by the vision of a young girl, who the player saved in a previous mission. The American Information Bureau (AIB) raises a black ops special forces unit which is deployed to the streets of Los Angeles. Vampires, known as 'nightwalkers', were found to be responsible for the disappearances of civilians in the United States and in other countries.

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