どうも、前世で殺戮の魔道具を作っていた子爵令嬢です。

Chloe, the viscount's daughter, made magical tools of murder in her previous life. She was reincarnated 1,000 years into a peaceful world. She regrets her previous life and decides to live an honest life in this one. One day, at her graduation party, her best friend's engagement is called off due to a lie. Chloe uncovers the truth to save her best friend...?