This is the story of how a new student at school overcomes his excessive shyness through his musical talent and love for jazz. At the center of the events is the insecure and gloomy pianist Kaoru, who often experiences panic attacks. He transfers to another school where he meets the charming Riko and the troublemaker Sentaro, who adores music. The new friends decide to create their own instrumental ensemble and choose a storage room in a record store as their rehearsal base.