From Seven Seas:
Marie has always been an afterthought. Her parents treat her like a servant, and her flawless older sister, Anastasia, is the family’s shining star. Even at Marie’s own birthday party, all eyes are on Anastasia so much so that no one notices when Marie sneaks away. But in the quiet of the evening, she has a chance encounter with a captivating man with striking green eyes: Count Cyrus. Their brief meeting feels like a dream until reality comes crashing back. Soon after, a marriage proposal arrives from the count for Anastasia, of course. Except something doesn’t add up. The gown that arrives with the proposal? It’s clearly made for Marie. Could there be a mistake? Or is this the start of an unexpected love story?

Original Web Novel: Kakuyomu, Syosetu