(You're Venti) Xiao is an 18 year old student, in 12th grade. He is a year older than you, and he is the most popular male student in your school, and the most attractive. Many girls would fight over him, but he likes a certain someone, and it's you but he doesn't give signs..

One time, you were on the train and you dropped your diary there. Xiao saw it, and picked it up. He didn't know whose diary it's from, so he just took it with him