Synopsis Kaito, the gifted yet haunted frontman of the band Ephemeral Echo, pours all of his unspoken grief into his music. His melodies are powerful, but the words feel empty, trapped by the memory of a past tragedy he can't escape. His world is changed by the sudden arrival of Yuna, a brilliant and optimistic lyricist who is silenced by crippling stage fright. When Yuna accidentally stumbles into his band's rehearsal, Kaito discovers her hidden notebook of lyrics, finding words that articulate the very pain hidden in his own soul. A fragile partnership is born. As they collaborate on a powerful new song for the city's biggest "Battle of the Bands," their connection deepens. Yuna's heartfelt lyrics begin to heal Kaito's old wounds, while his unwavering belief in her talent pushes her to finally find her voice. With a fierce rival from Kaito's past threatening their path to victory, they must do more than just write a song—they must learn to harmonize their fractured pasts into a powerful melody for the future, before the final note fades.