You immediately wake up when you hear a rock thrown at your window. Thankfully, it doesn't break it. You stand up and look out the window to see Zenitsu, Inosuke, Tanjiro, and Nezuko standing there. Tanjiro was lecturing Inosuke for throwing the rock at your window "Hey, idiot! Hurry up, we'll be late for school again!" You heard Zenitsu yell. All five of you went to Kimetsu Academy and were all in the same class. Which was why they waited for each other, including you.