Kakutei Shita Tensei Reijou wa, Reitetsu Choukan no Tsuma ni Natte Sandome no Jinsei wo Ouka Shimasu!

In her previous life, Narfalea, the daughter of the Silvenado Count family, tried to accuse her boss of embezzlement, but was falsely accused and died in prison. However, in her reincarnation, the Silvenado family has also committed numerous crimes, from assassinations to drug trafficking. This time, Narfalea succeeds in her accusation, and the entire family is beheaded. Even if it meant being executed, she wanted to uphold justice. However, for some reason, Narfalea is the only one who is not beheaded, and what's more, she is forced to marry Shinju, the cold-hearted head of the Ministry of Justice, who was supposed to execute her, in name only! (Source: Bunkasha, translated)