Given the Movie

High school student Uenoyama Ritsuka is shocked when he hears Satou Mafuyu's singing voice. He and his other bandmates, Nakayama Haruki and Kaji Akihiko, then welcome him into their band as a vocalist. After Mafuyu joins, their first live performance is a huge success, and they make their official debut as the band "Given." In the midst of all this, Ritsuka realizes that he has feelings for Mafuyu and they start seeing each other. Meanwhile, Haruki secretly has had feelings for Akihiko for years, but Akihiko was still in a relationship with his roommate, the violinist Murata Ugetsu. Haruki, Akihiko, and Ugetsu's love clashes and starts to move forward. (Crunchyroll)