Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 6 - 6-4. The First Thieves [Revised]

Ever since she transmigrated, she was blessed with an inbuilt anti-poison detector.

Even after knowing what came next....I still accepted.A deal with the devil herself.A devil, in the form of a goddess.I accepted a life that I knew wouldn't end well, a life that was worse off than the very curel one I already lived.But I still choose to do it.I chose to become the villain.

Elena, who spent her entire life as a cold-blooded female knight to avenge her family, ended up dying without claiming her revenge. When she opened her eyes she found that she went back into the past. By day she was a lady in a dress, and at night she carried a sword to change history and prevent her family’s destruction.