Each day a young girl in a mask stands on the shore and croons an old, wistful tune in the wind. After two sudden, heartbreaking separations in her childhood, Nino Arisugawa has been offering her voice to the sea, bound by a pact she made with two childhood companions—her first love Momo Sakaki and a music‑making boy, Kanade "Yuzu" Yuzuriha. Though the two boys had never met one another, each vowed that if Nino ever lost her way from them, her song would serve as a guiding light to bring them back together.
Six years later fate has brought Nino, Momo and Yuzu into the same high school. Yet time has altered many facets of their lives—while Nino strives to honor the promise she once made, Yuzu"s old feelings for her awaken again, and Momo works hard to keep Nino from reuniting with them. Through music, can they heal their friendship and navigate the tangled emotions of this complex love triangle and find hope?
