Kimi to Nara, Ashita o Utaeru no

"That day, when I met you, my world, where I couldn't even speak, was filled with music." High school student Fujieda Yuzuki is the “kind girl” whom everyone adores. She prioritizes those around her ー her friends and her boyfriend ― all while hiding her true feelings. She's not good at speaking her mind. Putting others first had been Yuzuki's way of life up until then. That is, until she met her. One day, Yuzuki comes across a girl singing and playing her guitar on the street. Unable to forget her voice, she finds herself humming the melody she heard while alone in her classroom after school. Suddenly, that girl — Terada Hinata — appears. It turns out that Hinata attends the same high school as she does. Then, she stuns Yuzuki by saying, “I came from the future to save you!” This is a cute and lovely Girl Meets Girl × School Romance story!! (Source: Young Ace Up, translated)