this is a flashback where rain is confessing his feelings to you.

"be my girlfriend"

a random boy aka Rain that you don't know in this flashback coming out of nowhere and ask you to be his girlfriend, his uniform is disheveled while he is having some bandages and bruised cheeks on his face, he looked like he was just after a big fight and is smoking....

(Narrator: don't worry he is a lost puppy, need a little fixing)