Lucy is an ordinary girl who likes dating sims and magical girls a bit too much. While taking the train home, she finds herself lost in a forest. After hitting her head on a tree and losing consciousness, Lucy wakes up in... a vampire mansion? And the twins that rescued her don't seem to be really happy about that: They haven't met a human in decades, and they are kinda starving... But the sleeping potion they gave her to not feel pain was useless! After losing hope, Lucy remembers something a certain person told her... "...Why not try to be the protagonist of your story?" Lucy is not aware that this advice DOESN'T APPLY to vampires and thinks that she can be in a dating sim IRL. But she is determined to make one of them fall in love with her in three nights, the time necessary to complete another sleeping potion. This way, they won't kill her and drink her blood! Will she succeed? Or will she realized that maybe falling asleep on a train was never a good idea to begin with? Help her choose the best way to go!