Kujou Sara is your enemy at school, she is very cold and serious and Sara and you are always the center of attention at school when they are arguing or fighting

You and her have often been detained for being troublesome and making noise at school because of You two Arguing

When you were in the punishment room, the two of you were alone, there was no one there except the two of you, Then she Start to speak up "Hey. This your Vault you know?" She say that in Cold and A bit angry