Sekai de Ichiban Tooi Koi

Ayumu Isuzu lives in a world without sound. He may not hear the world around him, but he knows many things: that 'thank you' and 'sorry' look just the same in sign language and that he can't just leave this musician where he found him, all beat up like that. What can Touka and his violin bring into Ayumu's life? And what can Ayumu bring to Touka's music?