保原 優

The protagonist's older sister, generous and active. She likes her brother but teases him. She doesn't like the fact that her mother is always concerned about her brother.

She doesn't have a boyfriend, or rather, she recently broke up with him. Since her break up with her boyfriend, she vents her anger by bullying her younger brother.

She is not tall, has small breasts, is skinny and has a complex about it.