Hi, I am a viscount daughter who made a demon tool for killing in my previous life. (1) / Let it go Flow comic

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In order to atone for the sins of his previous life, Chloe, the daughter of the Viscount, was in danger of his life by unraveling the truth of the controversy over the cancellation of his engagement? Chloe, the daughter of the Viscount, made a demon tool for killing in his previous life. After a thousand years, she reborn into a peaceful world. She regrets her previous life and decides to live in this world. Chloe is in danger of unraveling the truth, Kasuga?