Seiryakukon Kougou wa Fukushuu no Doku ni Saku

Amelia, the daughter of Yua Levanna's second queen, is despised by the royal family due to her inherited "poison magic," a unique ability from her mother. After enduring torment and witnessing her mother's tragic demise, as the kingdom exploited her poison for military gain, Amelia clings to her mother's dying words: "No matter what happens, don't give up."

One fateful day, the enigmatic northern empire of Saulverka announces that its emperor seeks a new wife. Meanwhile, Amelia's half-brother Craig seizes the throne of Yua Levanna by assassinating the previous king and sends Amelia to the notorious and cold-hearted Emperor Noam in Saulverka. Her reception by Noam is chilling and unwelcoming.

While lamenting her existence, Amelia uncovers the truth behind her mother's death. Fueled by an intense desire for revenge, she embraces her seething anger and vows to avenge her mother against the royal family.

(Source: NHN comico)