Duke’s daughter Eleanor regains her past-life memories and realizes she has been reincarnated as the villainess in Mad Love’s Flower, an otome game legendary for its extreme yandere love interests, men who lock up their lovers or preserve them like specimens! As a hardcore yandere fanatic in her past life, Eleanor is thrilled! The catch? Every single route ends in a gruesome Bad End for the couples, and Eleanor dies in all of them. Vowing to use her game knowledge to guide these terrifyingly affectionate couples to wholesome "Happy Yandere Endings," she interferes behind the scenes. However, her actions catch the intense eye of her stepbrother, Luke, a major yandere love interest who was supposed to be obsessed with a maid but is now directing his dark, possessive fixation onto Eleanor instead!