Grindah, Allan Mustafa leads a trio of post-show blues, with Beats, Hugo Chegwin working at a bowling alley and Steves, Steve Stamp still bunkered in the Brentford flats. Three years after Kurupt FM’s final transmission, their once-bright momentum has flattened into dead-end routines, until a spark arrives in the form of a surprise breakthrough. Chabuddy Gul’s news hits: their track, Heart Monitor Riddem, has exploded in Japan on a popular game show, and the show’s producers want to fly them over for a potential record deal. The prospect rekindles old ambitions, and Miche, Grindah’s wife, soon joins the journey as tickets and plans come together.
In Tokyo, the entourage receives a manager and a translator to steer them through unfamiliar territory. Taka, Ken Yamamura takes the lead as their manager, while Miki, Hitomi Souno, acts as translator and becomes a key fixture on the trip, even helping Steves in his more outlandish moments. But early friction surfaces quickly: Chabuddy G’s grip on leadership is challenged as Taka’s presence tugs attention away, and Chabuddy is even kicked out of a club as the new regime asserts itself. The dynamics grow tenser as Miki forms a close but complicated bond with Steves, while Taka’s publicist moves cast Grindah as the central figure, leaving the rest feeling sidelined.
The company’s plan for a Japan debut is ambitious but opaque, with a concert and a record deal looming within days. The terms and conditions are murky because Chabuddy secretly deleted the email containing the small print, leaving the crew unsure about what they’re signing up for. Their first day in Japan doesn’t unfold as planned: instead of stepping into a studio, they’re ushered into a dance studio to perform a routine tied to the game show, a move orchestrated by Taka to showcase a persona that may win over the Japanese audience. Grindah insists the dances are essential for their success, even as the rest drift toward disquiet and doubt.
A photo shoot in flashy outfits exposes the widening rift within the group. Taka’s public positioning of Grindah as the face of the act ignites tension with the other members, and the mood grows fractious. At a dinner with Miche and Taka, Chabuddy’s jealousy boils over as he confronts Grindah, pressing him to choose between him and the new manager. Grindah refuses to pick sides, leaving Chabuddy feeling sidelined and defeated.
The feud between Beats and Grindah comes to a head when they’re slated to perform as the “Bang Boys” on the game show. Right before filming, Beats accuses Grindah of selling out and neglecting their garage roots, and a heated altercation erupts. The fallout sees the rest of the crew walk away, and Grindah appears on the show solo, plagued by nerves and a sense of disconnection from his friends. A failed recording session with a J-pop artist later reinforces the sense that their plans aren’t shaping up as hoped.
Meanwhile, Steves harbors feelings for Miki but struggles to voice them, and a drunken Chabuddy compels himself to buy rounds for strangers, blurring the lines between generosity and extravagance. When the barman, Yuta, reveals that Taka’s tab has been closed, Chabuddy realizes he’s run up hundreds of pounds and flees the hotel, ending up briefly homeless as the night spirals.
On the day of the concert, Grindah arrives alone, unsettled by the absence of his former crew and his sense that he’s drifted from the roots that defined them. He hides in a bathroom stall, while Chabuddy G traces a Bang Boys van to the venue and eventually vacates his post as Grindah falters. When the Bang Boys take the stage, Chabuddy and Miki persuade Taka’s managers that Grindah knows the dance routine, and they walk away, leaving the stage to callous improvised performances.
What remains of Kurupt FM congregates in a karaoke bar, nursing a mix of frustration, nostalgia, and hope. Then Grindah re-enters, reaffirming the band’s friendship as the “best thing to happen” to him, and the rest of the crew arrives to accompany him in an emotional karaoke rendition of Heart Monitor Riddem. The moment is imperfect but cathartic, with Taka’s missteps on stage adding a touch of comedy to the sorrow. In the closing credits, the plans are set for a future: Kurupt FM is poised to release its first album, Miche hopes to publish a book, and Steves and Miki formalize their partnership as domestic partners—but how Steves will eventually find his way back to England remains unresolved.
