Empress of Obelian Empire: His Star Empress (Claude x OC)

Princess Lucélia Mimi de Stella is the only and youngest princess of Kingdom of Stella or known as the Kingdom of the Stars. She has been childhood friends of the princes of Obelian Empire, Anastacius de Alger Obelia and Claude de Alger Obelia. She was supposed to be the fiancée of Anastacius but after she and Claude caught Anastacius and Claude's fiancée, Lady Penelope Judith, the princess break off their engagement. Claude then finally usurped the throne from Anastacius and become the emperor with the help of his knight, Felix Robane and backing of Kingdom of Stella.

Claude was in despair in knowing that his lover, Diana chooses the baby that is eating away her life over him, being betrayed he started to become cold. Princess Lucélia or preferably called as Princess Mimi has befriends Diana and despite her best trying to make Claude seeing reason then promise Diana that she will support Diana and protect the baby when the baby is born. Diana died in childbirth not before giving hers and Claude's daughter a name, Athanasia. After Diana's death Claude massacred all the concubines in the Ruby Palace and as he was about to killed Athanasia, Mimi protects her and beg him to spare the baby because she didn't do anything wrong and deserve to live. Despite so, Claude abandoned his daughter to be raised by maids.

Not long after, Claude marries Mimi for political reason since she is the only one that Claude trust and also the hope of Obelian Empire and Kingdom of Stella to stabilize the chaos ensued after that.

How does Mimi fare to be the Empress of Obelian Empire and wife to the tyrant emperor? Will Claude able to learn about love and completely entrust his heart again?