Catarina Claes is a young woman born into a family of nobility who has a memory of her past life as a high school student. She was reincarnated as a Villainess in an otome game called Fortune Lover. Exile or death were all that awaited her in this new world. However, she managed to evade these ends, and somehow made it through the year to spring break. As fate would have it, both Catarina and her adopted brother, Keith, were to board a state-of-the-art luxury liner called the Vinculum on its maiden voyage during their time away from the Academy.