Nino Arisugawa loves to sing. As a child, she met two boys that changed her life: Momo and Yuzu. One broke her heart while the other one mended it. Making a promise with each one of them, they all part their separate ways, but Nino commits to singing every day. She hopes that one day her songs will reach them. Her first year of high school starts, and so does her reunion with childhood friends who would rather forget than remember their time together.
Nino starts her first day of high school and bumps into an old friend unexpectedly. Thrust into the spotlight, Nino unleashes her voice in hopes of being found.
Nino recalls childhood memories of Momo, leading up to the moment she first meets Yuzu. Meanwhile, Yuzu is having a hard time reconciling the past and present.
In her search for Momo, Nino starts to practice her singing with some help from Miou. Everything changes when she sees a contest being sponsored by Momo!
Nino can't stop blaming herself for what happened to Yuzu. In the meantime, Yuzu is determined to make Nino sing for him.
Nino and Momo finally cross paths, but their reunion is cut short when Momo lets his past get in the way. In the meantime, Yuzu is waiting for Nino to perform his music.
When Nino is given Momo's damaged guitar, she is determined to learn how to play. Meanwhile, Yuzu's feelings grow stronger.
Yuzu’s mother won’t let him write music, so he’s forced to write it somewhere else. Momo, sensing Yuzu's distress, invites him over, and they bond over their love of music.
Emotions run rampant as Momo and Nino finally meet, but reality leaves a bitter taste. Yuzu struggles to accept Momo as a friend, and love rival.
In the aftermath of Yuzu's bold move, Nino finds herself rethinking their relationship. Later, Momo confronts Yuzu with the truth... and a challenge.
Things are heating up as the gang gets closer to Rock Horizon. With stakes high for Yuzu and Momo, Nino is left with a need to improve.
Momo meets his mother in an unpleasant reunion, only to be met with an ultimatum. In the meantime, the gang is ready to perform, and Nino isn’t backing down.
Nino is playing her heart out at Rock Horizon, but things get tricky when Yuzu gets a surprise visit from the last person he expected.