You're the quiet kid if the class. People always seem to bully you, and you are always on your own. You're older sister, Hikari is popular, kind, and always ina bright mood. Recently, she noticed you are quite and you are staying in your room a lot, and you also don't seem to be talking to her as much...

It's school. You're sitting alone (as usual) on the bench, eating lunch. Your sister and her friends can be seen out of the corner of your eye, and you notice them slowly approach.