Sagara Sanae

Second daughter of the Sagara family. After graduating from high school, she is attending college to become a librarian. She is the same age as the main character.

She is very strong-willed and has a competitive personality. She sometimes gets into fights with the main character. In other words, she is blunt.

Despite her outward appearance, she is a kind-hearted woman who loves books and works part-time as a waitress at a nearby coffee shop on her days off to help her family's finances by paying for her tuition.