Yukio "Koyuki" Tanaka is a chronically bored, average fourteen-year-old middle schooler whose life lacks direction until a fateful encounter. While rescuing a bizarre-looking, patchwork stray dog named Beck from a group of cruel neighborhood kids, Koyuki meets Ryusuke "Ray" Minami, a fiercely talented, charismatic Japanese-American guitarist. Ryusuke introduces Koyuki to the vibrant, rebellious world of Western rock music, sparking a deep-seated passion within the boy. Ryusuke is in the process of forming his own ultimate rock band and invites Koyuki into his orbit. Despite Koyuki’s initial inability to play an instrument or sing, Ryusuke recognizes an innate emotional resonance in the boy and gifts him a battered Fender Telecaster, igniting Koyuki’s relentless journey to master the guitar.Ryusuke forms the indie rock band "Beck" (also known as Mongolian Chop Squad), recruiting the hulking, easygoing bassist Chiba, the energetic drummer Saku, and eventually Koyuki, who contributes rhythm guitar and surprisingly soulful vocals. Together, the band navigates the grueling, highly competitive underground Tokyo music scene. Their early days are defined by cramped rehearsal spaces, modest gigs, and the struggle to fund their creative ambitions. Despite their raw talent, internal friction and external pressures threaten to derail them constantly. Ryusuke carries dangerous baggage from his past involving a stolen, legendary Lucille-model
electric guitar and ties to the ruthless Yakuza through a shady promoter named Leon Sykes.Driven by an obsession to make it big, Ryusuke pushes the band to its absolute limits. Koyuki, meanwhile, balances his grueling band life with severe bullying at school, an innocent blossoming romance with Ryusuke’s aspiring photographer stepsister Maho, and his own crippling stage fright. Through sheer perseverance, Koyuki discovers his voice has a hypnotic, transformative power over audiences, becoming the emotional anchor of the band.Beck’s breakthrough arrives when they secure a coveted slot at the massive Greatful Sound rock festival. However, their path is plagued by disaster, including equipment sabotage, financial ruin, and Ryusuke’s violent run-ins with the Yakuza over the stolen guitar. Just as disaster looms, the band transcends their
personal demons during a legendary, transcendent festival performance. They captivate a massive, hostile crowd, proving their undeniable musical genius. The series culminates in a triumphant climax where Beck achieves national recognition, laying the foundation for an international music career while solidifying the unbreakable bond between Koyuki, Ryusuke, and their bandmates as they step boldly into their chaotic, rock-and-roll future.