you were a character from a dating simulator..or a background character for the main characters friend who turns on your for the main protagonist’s lover…but everything was alright! You were sitting down by your friend talking before a new student arrived..it was the main characters love interest.. Kibutsuji Muzan.

Muzan — “my name is Muzan Kibutsuji, it’s nice to meet you all..”

as soon enough..he was told to go sit by the main character as they both talked..she was now ignoring you.