Kenji Yasuyuki Okamura, Ota Tomoya Maeno and Asakura Tateto Serizawa are three high school delinquents who usually spend their time hanging out with each other and beating people up, though no fighting is ever shown on screen. Ota casually asks Kenji if he wants to go beat up the rival gang at Marutake High. Kenji agrees, and the three head out, but after realizing they have no idea where Marutake is, they lose interest.
Later on, Kenji is walking down the street when he witnesses a robbery. A passing musician thrusts his guitar into Kenji’s hands while he tackles the thief. Kenji takes the guitar home, and tells his friends the next day that they are going to start a band. They steal more instruments from the school to complete their ensemble. Kenji was unaware the guitar he stole was a bass, so the band ends up consisting of two basses, a snare and a tom drum. Knowing nothing about music, the only music they make is harsh, rhythmic noise. Still, the boys are inspired. Their first audience is Aya Ren Komai, their only other friend. When she asks what the band name is, Asakura suggests Kobujutsu (ancient martial arts), which Kenji agrees to without further thought.
Throughout the film, the story occasionally cuts to the mohawked gang at Marutake, led by a boy named Oba [Naoto Takenaka]. The gang believes Kenji is taking its members out in fights, when in reality they are being scared off by Kenji’s mere presence. Oba plots to teach Kenji a lesson.
The next day, Asakura learns that there’s a band at their school with an incredibly similar name, Kobijitsu (ancient fine arts). Instead of confronting the other band, Kenji decides to hear them play first. Kobijitsu is an acoustic folk trio led by singer Morita [Kami Hiraiwa]. While Kobijitsu are incredibly nervous to play for the school thugs, Kenji appreciates their music. In return, Kenji has Morita’s band listen to their music. Morita is absolutely blown away by the raw, primal energy of the band, and asks if they will play an upcoming rock festival with them. Kenji agrees. The band begins to practice for the festival, but Kenji becomes despondent, claiming he’s now bored of the band. Aya tries to talk some sense into him, but is unable to change his mind. After a short fight, Aya storms off, leaving the apathetic Kenji laying on the ground. Ota and Asakura are confident that Kenji will show up at the festival anyway.
On the day of the festival, Kenji is finally confronted by Oba’s gang. Before Oba can fight him, Kenji smashes his bass and pulls out a recorder, playing it for a stunned Oba before running off, the gang chasing after him. At the festival, Ota and Asakura plan to play alone as Kobujutsu. Morita’s Kobijitsu plays first. Inspired by Kenji’s band, Morita’s folk act has now become a fully fledged rock band. However, near the end, Morita’s guitar breaks, and they walk off dejectedly. When Ota and Asakura get on stage, they freeze up, as Kenji has still not arrived.
Kenji, still being chased while playing recorder, leaps on stage. Kobujutsu, reunited, begins to play, and Morita’s band joins in. Oba watches in disbelief as the crowd starts to get into the music. The band finishes their song, and Kenji, ecstatic, finally breaks out of his neutral exterior, and sings out passionately to the crowd.
The day after, Kenji has returned to his stoic self. Aya sits with him alone in an empty classroom, where Kenji reveals the band has broken up. Aya is disappointed, but Kenji goes on to ask if Aya will go to Disneyland with him. Ota sees the two talking, but quickly leaves. Outside, Ota asks Asakura if they should ask Kenji for a band reunion. Asakura agrees that Kenji will likely say yes later that day.
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