Anonymous Noise

Every day, a young girl wearing a mask stands by the beach and sings a nostalgic melody with her Close friend Y/n. Y/n has always been there for Her. After experiencing two sudden heart-wrenching partings when they were only a child, Nino Arisugawa has been singing her songs to the ocean, bound by a promise made with her two childhood friends-her first love, Momo Sakaki, and a boy who composed music, Kanade "Yuzu" Yuzuriha while Y/n has been screaming her heart out by singing for certain boy. Having never met each other, the boys both individually promised that if Nino and Y/n were ever separated from them, there voice would be the beacon to reunite them once again.
After six long years, destiny has finally placed Nino, Momo, Y/n and Yuzu in the same high school. However, the passage of time has changed many things in their lives-while Nino relentlessly attempts to fulfill her childhood promise with the boys, Y/n and Yuzu's feelings for their first love from the past resurface, and Momo goes to great lengths to prevent a reunion with Nino and Y/n. Through music, will they be able to mend their friendship and overcome all the feelings involved in this complicated love story ?