The Moon on a Rainy Night 1 by Kuzushiro

A high school girl's chance encounter with an enigmatic female classmate whose musical aspirations were complicated when an accident almost completely took her hearing leads to the slow blossoming of love. Perfect for fans of yuri series like Whisper Me a Love Song and sweet, sophisticated romances like A Sign of Affection.

One rainy night, Saki is rushing to a piano lesson when she crashes into a beautiful, long-haired girl, dropping her sheet music in the process. Saki stutters an apology, but the girl simply hands back her sheet music and leaves without a word. Saki begins her first day of high school the following morning, only to find the stranger from the night before sitting at the desk next to hers. She learns that the girl's name is Kanon and that she is not quite completely deaf, but very hard of hearing. Though Kanon needs to be close to people to read their lips, she tends to push people away with her icy demeanor. Through one kind gesture, Saki slowly begins breaking down the walls around Kanon, even as she feels something new blossoming within her.