Shiozuki Manami

She's a student in the class that the protagonist is in charge of, and a beautiful girl who has by far the best grades in her school year. Her gentle demeanor makes her popular with both boys and girls. As the student council president, she holds rules and commitments in high regard. However, she has an overly (?) methodical side: whenever she harbors a doubt about something, she won't be satisfied until she completely and thoroughly investigates it, no matter what that thing is.