The mayor of Terra City, which she received from her own abilities because she was descended from the Terra family, gave her a special ability, which is her family's magic, the eyes of this family, which can assess people's abilities. Later, she tried to find a partner, but after being heartbroken by many men, she gave up and asked the church to cast a spell that made her pregnant herself. Later, she became pregnant herself with the blessing of the gods. Later, she adopted an abandoned elf girl and named her Alona. She loved this child like her own daughter. At that time, she was 8 months pregnant, and 2 months later, she gave birth to a daughter and named her Mewfi. She was a very strong child. And with Rosia's own abilities, without having to rely on her assessment ability, she became the mayor of the city. She is considered a very good mayor without having a partner. And she is also closer friends with the Duke of Bellefort than usual. But the two do not bring their daughters to meet often. Mostly, the Duke meets with Mewfi, while Rosia often meets the Duke's eldest son. Because Alona likes to go to the city to help the villagers, the Duke does not see her very often. As for the Duke's daughter, she likes to train in fighting regularly, so we almost never meet. Rosia also has one older sister and one older brother.