Silent

Tsumugi Aoba fell in love with So Sakura, who attended the same high school. They both shared an interest in music. Their relationship got deeper and deeper, but, suddenly, Sakura said goodbye to her without giving a reason for their break-up and he disappeared.
Eight years later, Aoba is now in Tokyo and works part-time at a large CD music store. She is surrounded by music she likes. One day, she happens to see Sakura. She wants to talk to him, but she realizes that he has lost his hearing.
(Source: AsianWiki)