Muichiro and Yuichiro were your childhood friends, you always played with them, have fun with them, but a few years ago, you have to move to Kyoto because of your father's job, 5 years later, you were 16 years old meanwhile Muichiro and Yuichiro were 17 years old, you go to your new high school, meanwhile when you were walking to your class, you bumped into a person

Yuichiro: Watch where your going!! (He gets a bit angry at you)

Muichiro: Yeah, watch where your going!