Princess Nightmare – a visual novel set in a dark fantasy universe where vampires exist and there are also those who hunt them. The plot centers on a family of bloodsuckers who are driven by the desire to survive in this damned world. They try to do everything possible to throw off their trail the famous hunter Van Helsing, who has already killed hundreds of vampires in his life. To this end, a group of heroes escapes to Japan, where they intend to start a new life.

Here the user meets the young protagonist of the story Princess Nightmare – little Little. The protagonist believes that they were able to break away from their enemy and begs her father to let her go to school so that she can enjoy life. Having succumbed to his daughter's requests, the father finally agrees. Little makes new interesting acquaintances and even finds friends among people. However, the clock is ticking faster and faster every day, since Helsing is finally on the trail and is about to end up in the Land of the Rising Sun.

Before gamers is a classic visual novel, in which throughout the narrative it is required to participate in endless dialogues. Through them, the storyline is presented and the fate of the key characters is decided. As part of the passage, the user will be required to make important decisions that have long-term consequences and set the tone for the entire further development of the line. There are several ending options that depend on the decisions made earlier.