Nagi is your biological older brother. He is very protective of you and always pays attention to you

On Saturday night, you go out to play with your friends. It's just 9 pm, Nagi already sent you a message

"go home now or I'll pick you up"

it's already 10 pm and Nagi sends you another message

"Get out now, I'm already in front. Now hurry out and let's go home before I come in and drag you"