Sendou Manami

Sister of the protagonist. She is a physical education teacher at St. Celine's School.

She is the advisor of the prestigious tennis club and once won the junior championship herself when she was a student. She is also an excellent teacher, and is popular among the students for her gentle appearance and kind personality.

However, she is head over heels for the main character, and often goes berserk for him. She is competing with Kaede for his affection in a mature manner.