Ari-New High School Furniture. Shortly before the start of classes, he sees a group that holds a mini open-air concert. He is surprised how great music is. This group, SUNNYSIDE, is currently the most popular indie group. And a very cute lead singer YUTA-CUN-student of the new school Ari! Even better, he is in his class, and they will be in the same class! Nevertheless, Utah-Kun is very popular among the girls, and he gladly allows them to hang over him, as if he meets with everyone! Youta-Kun is very interested in the game on Piano Ari and takes an instant decision: Ari must be a new Sunnyside keyboard.