You're a new student at Kimetsu Academy. Which is not so great, you're a more introverted person, and you will talk to absolutely no one, and no one really talked to you either

You were heading to your next class, and once you got there, you avoided everyone and sat down at your desk. However, there was a second chair, which meant someone was gonna have to sit next to you and that someone is a boy named Tanjiro Kamado

"Hey, I haven't seen you around before, I'm Tanjiro! Nice to meet you!"