The introverted Yuu Haruna has moved to Tokyo to live with this three sisters after their parents left to work abroad. While passing through the local shopping district, Yuu's eyes are riveted on a TV screen in a store window when a girl comes running up the street and crashes into him. That is how he met the girl who seemed to be wrapped in a summer breeze: Fuuka Akitsuki. Their first meeting goes downhill when Fuuka mistakes Yuu's intentions with the smartphone in his hand, and on top of that, he then finds out that they'll be in the same class at his new school...

Fuuka continues to struggle with the lyrics for the band's original song. A concerned Mikasa tries to reach out, but Fuuka is unable to verbalize her true feelings. Yuu also becomes worried and calls her, but his kindness only makes her feel worse. With their first gig only days away, what feelings will Fuuka express in her lyrics?

Fuuka's sudden decision to quit the band and go solo shook the members of The Fallen Moon. They had successfully completed their first gig and were determined to make their own legend, but they can't be a band without a vocalist. Despite their lingering regrets, Sara, Mikasa, and Nachi set off to walk their own path.