A grotesque, horrifying, mysterious incident befalls 12-year-old Yumi. At Yumi's birthday party, which she invites classmates to, her mischievous older sister Mari puts a toy toad's leg in the food. Sayuri, who has an abnormal hatred for frogs, ends up eating it. However, when she spat it out, the frog's leg was still slithering about as if it was alive. Sayuri stayed home from school after that, but terrifying changes began to occur to her body... (Source: K-Manga)

Barbara Seitel, the daughter of a count who loves handsome men, was a university student in Japan in her previous life. Due to a freak accident, she was reincarnated into her favorite book, and now, at the age of 18, she has a happy arranged marriage meeting, but who is her partner?! A wicked duke who will (supposedly) plunge the country into the depths of terror in the future!? If I fall in love with him, both myself and my family will be ruined. Even though I know this in my head, the duke's refreshingly handsome personality makes my heart flutter, and I can't stop my excitement from building... Now that it's come to this, is there no other option but to pursue a happy ending with him and his stepdaughter, the future villainess (provisional name), who will commit evil deeds with him?! "I'll show you I can avoid a bad ending!!"

Sayaka and Kaori are two step-sisters who are so close to each other that it is hard to believe they are not related by blood. But Kaori's mother is very jealous of Sayaka, thinking that she outshines Kaori, and so she starts to use black magic in order to curse her step-daughter. br>As Sayaka's face starts to show signs of disfigurement, Kaori tries to stop her mother and to break the curse.