晴見フィルが仙台オーケストラフェスティバルに参加できることになった。晴見フィルにとっては、今後の活動を続けるための最後の望みであり、最後の演奏になるかもしれない。しかし、再びみんなで演奏できることに古谷（玉山鉄二）たちは大喜び。けれど、遠征費用も練習場所もなく課題は山積みだ。
その後、瑠李（新木優子）の尽力で、ようやく晴見フィルの練習会場が見つかった。熱海にある保養施設だ。響（芦田愛菜）も大輝（宮沢氷魚）に誘われて一緒に車で現地へ。
そんな折、ドイツのシュナイダー先生から俊平（西島秀俊）に譜面が届く。
その譜面にインスピレーションを受け、俊平は久しぶりに曲作りに没頭し……
そして、響は、音楽合宿で俊平の思いを知り、動き出す……
The Harumi Philharmonic Orchestra will be able to participate in the Sendai Orchestra Festival. For the Harumi Philharmonic Orchestra, it is their last hope to continue their activities, and it could be their last performance. However, Furuya (Tetsuji Tamayama) and the others are overjoyed to be able to play together again. However, they have no money for the expedition and no place to practise, so the challenges are piling up. Thanks to the efforts of Ruri (Yuko Shinki), the Harumi Philharmonic finally finds a place to practise. It is a recreation facility in Atami. Hibiki (Ashida Mana) is also invited by Daiki (Miyazawa Hyouou) and they drive there together. Then, Shumpei (Hidetoshi Nishijima) receives a musical score from Dr Schneider in Germany. Inspired by the score, Shumpei immerses himself in songwriting for the first time in a long time. ...... Then, Hibiki learns of Shumpei's thoughts at the music camp and makes his move. ......
