흡혈귀의 연애방법 프롤로그 is a game where the story unfolds based on the user's choices. The user can choose different options to pursue the romance of the heroines. The game is set in a high school where the protagonist, after experiencing repeated transfers, hopes for a peaceful life with his younger sister and childhood friend. However, their peaceful life is shattered by an unexpected intruder. The protagonist discovers the existence of vampires and is faced with the choice of either protecting his family and friends from the vampires or becoming an ally to the vampires as a human. This leads to a thrilling double life where he must hide his true identity from his sister and childhood friend. The game is available for free on Android.