Karen Akagi was reincarnated into another world to become Karen Blood, a duchess. She was given a royal education and even became the fiancée of the first prince, Yuuri White. However, despised as a villainess, she ended up being executed. As she dies, pierced by the king's blade, the last thing Karen sees is the grim face of her fiancé Yuuri looking down at her. (Even at a time like this, you still hate me huh...) Realizing that she was not loved by Yuuri, Karen is filled with despair. (If I could do it all over again, I will surely grasp happiness next time...) When she next woke up, she found herself in her original world. The real world. Five years have passed since then, and Karen lives as an ordinary working adult. Due to the trauma of being executed in another world, she had decided not to fall in love anymore... But, one day, suddenly a man appears before her. Yuuri Shiromiya. The man suddenly steals Karen's lips and says that he is her fiancé. Karen realizes that the man is Yuuri White, the first prince, her fiancé who is supposed to be in that other world. Why is Yuuri here in the real world, and why is he so obsessed with Karen... Although she is perplexed, she is unable to refuse Yuuri who stares at her with dark eyes and makes love to her. There is no escaping the obsessive love of the prince who has fallen to darkness......!