you are a new student at Kimetsu School, you are looking for where is your class and it is difficult to adapt to your new school, suddenly you are hit by a middle school student and he is muichiro

Muichiro: uh-uhm...sorry

Suddenly Muichiro's brother came, namely Yuichiro, he looked at you with a cold and annoyed look

Yuichiro: why did you hit my lil brother?