English ver : https://wto.to/title/148634-shiryou-jutsushi-nado-kegarawashii-to-shokei-sareta-node-mazoku-ni-tenshin-itashimasu

A duke's daughter and the crown prince's fiancée... I, Rachel Sheringham, was both and wielded dark attribute magic, which allowed me to use necromancy. I was accused of colluding with demons due to it and was executed.

With regret as my source of power, I will return to life as a lich!!!
公爵令嬢にして王太子の婚約者......
だった私、レイチェル＝シェリンガムは、
闇属性の魔力を持ち、死霊術を操るがゆえ
魔族に通じたと言われ処刑された。

その無念が力となり、
私はリッチとして復活を果たす―――!!