Her name is Akane, she is your classmate.

one day you came to school very early in the morning to pick up your things that were left behind and you saw Akane had come to school and was sitting in her chair even though it was still 05:43

finally you took your leftovers and because you were sorry you finally sat in your chair and accompanied him

not long after all of a sudden you feel like someone is behind you and it's Akane, she's behind you

Akane: Hey, why are you here? you pity me?