Episode 10 of "Glass Heart" kicks off with Tenblank's grand entrance at Isagi's music festival, the atmosphere electric with anticipation. Isagi turns to Naoki, a hint of doubt creeping into his voice, asking if he truly believes he's saving him. Naoki, conscience-stricken, apologizes for having meddled with his creative spirit. As the band ascends the stage, the roar of the crowd washes over them, a testament to their eagerly awaited performance.
Akane's mother, watching her daughter's every move on the screen, beams with pride, noting the genuine happiness radiating from her face. Meanwhile, Yukino lingers backstage, her phone glinting with a message from Naoki, urging her to join them on stage. Isagi confronts her, his words laden with venom, pronouncing the end of her career over her live streaming escapades. But before the confrontation can escalate, Tenblank launches into Yukino's duet with Naoki, catching everyone by surprise.
Akane seizes the microphone, her introduction heartfelt and passionate, bringing Yukino to tears as she steps into the spotlight. Backstage, Isagi attempts to provoke Kai, but his efforts fall flat. Kai, candid and self-aware, confesses to having sabotaged herself, vowing not to share Isagi's fate of being haunted by a genius's shadow.
As Yukino's performance wraps up, news of Naoki's illness spreads like wildfire online. The crowd demands answers, and Naoki rises to the occasion, delivering a poignant speech about the unpredictability of life and the importance of cherishing every moment. He assures his fans that tonight, Tenblank aims to share their unique sound with the world.
They launch into "Chasing Blurry Lines," but Naoki's energy begins to wane. Enter Toya, stepping onto the stage to lend his voice to Naoki's, their harmonious blend moving even Isagi to tears. His mind flashes back to Naoki's wisdom - that music transcends winners and losers, existing purely for its own sake.
The concert concludes with their new song, "Glass Heart." Naoki reflects on how his music once shattered people's fragile hearts but how his bandmates have given him new life. In a gesture of deep affection, he professes his love for them. Halfway through the song, Naoki invokes a promise from the crowd - a promise to meet again. And with that, Episode 10 of "Glass Heart" draws to a close, the final notes of the song lingering in the air, marking the triumphant culmination of a successful concert.
