That day, when I met you—my silent world, where I couldn’t even raise my own voice, became filled with music. Yuuzuki Fujieda, a high school girl, is known as the “kind one” whom everyone likes. She always puts others first—friends, boyfriend, anyone—while hiding her own true feelings. She’s never been good at expressing her own “voice.” That’s the way she has lived her life… until the day she met her. One day, Yuuzuki encounters a girl singing and playing guitar on the street. That unforgettable voice lingers in her heart. Later, as Yuuzuki hums the tune alone in her classroom, the girl—Hinata Terada—appears before her. To her surprise, Hinata is a fellow student at the same school. Even more shocking, Hinata claims, “I came from the future to save you.” A girl-meets-girl × youth school story, where music and destiny intertwine!