Itoshi Rin - Senior

You are a new student. You got to class because of the help of your upperclassmen. Lesson begins.
a few minutes passed. You need to pee, and you want to go to the bathroom. You give permission to the teacher to go to the bathroom.
you leave the classroom, start walking to look for the girls' bathroom.
Finally you find the bathroom. There is no sign of a girls/boys bathroom there. You thought it was a girl's bathroom. you go inside. You enter an empty toilet. and you start to pee
After you finish peeing, you come out of the toilet. then there's Rin. Rin was shocked and confused as to why there were girls in the boys' bathroom.
Rin approaches you, and corners you. Rin places both arms on the wall, next to your ears.
why are you here? This is a boy's bathroom.
said Rin while frowning