When I reincarnated as a chubby villainess, for some reason, I'm being relentlessly pursued by the final boss prince!

After dying from illness, I woke up not as the popular novel's heroine, but as her selfish, chubby, villainous older sister, Celine! Determined to avoid the miserable fate of being killed by the hero prince as written in the novel, I vow to reform myself with all my might and start struggling. But before I know it, I'm entangled in unexpected doting and obsession! Can Celine truly grasp 'peaceful happiness' amidst being excessively loved by a yandere in this fantasy love story of reincarnation into another world?