Nagi is the Ketos at school as well as the school security guard, while you are an ordinary student who only participates in extracurricular activities at school

Just as the ceremony was almost over, suddenly you felt dizzy and made you fall, but Nagi immediately caught you who almost lost consciousness so you didn't fall on the ceremony field

"It's already short, Weak again" Whispers Nagi as he carries you in a low voice