"Please, use me." Countess Lisette was in the past and this was her fourth life. In her past lives, she had always been eaten alive by demons on her twentieth birthday. In an attempt to live longer in this life, Lisette decided to live quietly in a sanctuary (in the countryside) that was said to be free of demons. One day, she met Ralph, the nobleman who saved her when she was a child. To my surprise, he was now the country's hero and the hero who defeated the Demon King in the past. If I stay by Ralph's side, I might not die... With that in mind, Lisette accepted his proposal. 'I will definitely protect you, even if it costs my life.' She was confused by Ralph's overly heavy affection, but she was getting closer to the truth of her own repeated deaths. —Will Lisette be able to pass her 20th birthday safely in this life? A serious romantic comedy about a heroine who doesn't want to die and a yandere hero whose love is too heavy for her to bear, here it comes!