Very interesting... So, I can assume this a continuation from your novel. If so... Looks very promising! I haven't finished the novel yet but there is certainly a lot dialogue that is very reminiscent of it.
Cynthia finally becomes the ruler of the new realm.
In return, she lost a part of her memory during her accession to become the Queen of the world.
Her sister Nanami initiates a plan to reunite the man who sacrificed everything for what her sister has become today.
What would happen to both the siblings? As Cynthia is agitated when she encounters Nanami, the Princess of Demon Realms, a twin, an exact opposite of Cynthia's identity