Koyuki Tanaka is in a dead end. At age 14, he has lost his passion for life. But a casual meeting of Koyuki with a young musician named Ryusuke is about to open a new path in front of him.

When Koyuki accepts Ryusuke's invitation to see his band perform live, he unwittingly sets down a path of self-discovery. But what Koyuki finds both disturbs and intrigues him, as the youngster uncovers the best and worst aspects of human nature. And though his world begins to expand, self-doubt and uncertainty threaten to send it collapsing in on itself.

Koyuki tries to memorize the scales at Saitou's place. Later we can see Koyuki talking with the bullies and then scolded in the teacher's office. Maho meets with him, and at Saitou's place, Koyuki tells her why he started to work for the old man. This marks the first appearance of Ryusuke's guitar, "Prudence" ("Lucille" in the Japanese original), notable for the several bullet holes it bears.

After the band seems to break up before their time on the third stage, the band is slowly reforming just in time to play their hearts out for the growing crowd. Ryuusuke has returned after being given Prudence to play on and Chiba races back to the third stage after thwarting his kidnappers. Meanwhile, the worsening weather forces interruptions at the other two stages, frustrating Eiji and angering Sykes.

As Beck's set finishes up, the reality that it's Beck's last performance finally sets in. Koyuki and Maho realize their love for each other and time goes on and the members of BECK move on with their lives. One month and a half later, Koyuki gets an unexpected phone call from Kazuo Sato, who takes her to a meeting with none other than Sykes, who had seen him perform at Greatful Sound and expresses his desire to produce a solo album for Koyuki, but he politely refuses. With Ryusuke missing, Chiba wanting to assemble his own ramen shop, Taira in another band and the news that Saku will transfer to another school, Koyuki's uneasiness returns day by day, even more so after he and Saku part ways.

Koyuki plans to revive Beck and sets out to get the band together. After talking to Chiba and Taira and getting them to join, Saku finally makes his way back to town to join up with the others and the band is finally back together (except for Ryusuke, who is making a living as a street musician in New York City when John Lee Davis approaches him offering help in anything he might need). Great news comes in the form of an invitation to tour with a band in the United States of America, and along the way they end up meeting Ryusuke again at Seattle. Leon Sykes also gets arrested. Beck plays a gig, all of them including Ryuusuke, their future is told in the manga (which also chronicles the lead-up to the US Tour in more detail).