Yuuhi is the main heroine in the series. She is a transfer student to Jun'ichi's school and met him on her first day to school. She is a strong-willed and stubborn person, and is Jun'ichi's fiancé.
Karen is a second year student that is in the same class as Jun'ichi. She is an original character that was first introduced in Parallel. She comes from a very rich family like Yuuhi and prides herself on acting like a lady.