"Fukumenkei Noise" is a romantic drama anime centered around music, unrequited love, and the intertwining lives of its three main characters. The story revolves around Nino Arisugawa, a passionate singer who uses her voice to express her emotions, particularly her longing for Momo Sakaki, a childhood friend who promised to return to her if she continued singing. Nino's life takes a turn when she meets Yuzu Yuzuriha, a talented composer who becomes captivated by her voice and encourages her to pursue music more seriously.

Nino, Yuzu, and Momo share a complicated history. As children, Nino and Momo bonded over music, with Momo composing songs for her to sing. However, Momo abruptly left without explanation, leaving Nino heartbroken. Years later, Nino attends high school and joins the music club, where she meets Yuzu, who recognizes her voice and becomes determined to create music with her. Unbeknownst to Nino, Momo is also at the same school, hiding his identity as the lead singer of the popular band In No Hurry to Shout. Momo struggles with his feelings for Nino and his desire to protect her from the pain of their shared past.

The narrative explores the emotional conflicts between the three characters as they navigate their relationships and ambitions. Nino remains torn between her lingering feelings for Momo and her growing connection with Yuzu, who supports her unconditionally. Yuzu, in turn, harbors his own feelings for Nino but is aware of her unresolved attachment to Momo. Meanwhile, Momo grapples with guilt over leaving Nino and his inability to fully reveal his identity to her.

The series delves into themes of love, identity, and the power of music to connect people. As Nino, Yuzu, and Momo collaborate and compete in the music scene, their personal struggles and unresolved emotions come to the forefront. The story builds toward a climactic resolution as the characters confront their pasts and make decisions about their futures, both in love and in their musical careers. The anime balances heartfelt moments with the tension of unspoken feelings, creating a compelling narrative driven by its characters' emotional journeys.