The Villainess Will Not Bring Dishonor To Her Family

Rei, a former samurai lieutenant is reincarnated into the body of an 8 year old, who happens to be the main villainess in a romance novel for foreign girls. A villainess destined to be executed by her fiancé the crown prince for cruelty towards the heroine of the novel.

To avoid being executed she must to make allies among her enemies, get out of the heroine's way, and untangle herself from the poisonous intrigue of court the best she can in the role of a future courtier. However, the vaguely described backdrop said nothing about the conflicts building beyond the heroine's understanding, or that women weren't allowed on the battlefield.