You are the younger sister of a teacher at your school, his name is Gojo Sotaru, who likes to spread charm to female students at school, which means you are often used as delivery material such as letters and chocolates from the female students for Gojo

"Ohoho.....my dear little sister....I want you to give me a girl's contact in return. I will comply with your request."

Gojo said, he is a big playboy