Hidamari ga Kikoeru

The story starts with college student Taichi, who comes from a not-so-well-off household and is desperately searching for work. He (literally) stumbles across fellow student Kouhei while on a job hunt, and is incredibly enticed by the delicious bento Kouhei has in hand. However, something seems a bit off about Kouhei and when Taichi consults his friends about it, he gets an answer he really wasn't expecting: Kouhei is severely hearing impaired.

Hidamari ga Kikoeru - Limit
College student, Kouhei is hard of hearing and so he distances himself from those around him. He then meets Taiichi, a classmate who's got a bright personality and speaks his mind. "It's not your fault that you can't hear." When Taiichi speaks these words, Kouhei is suddenly saved by those words... More than friends. Less than lovers. His meeting with Taiichi will change him.

In the series:
Vol. 1 - Hidamari ga Kikoeru
Vol. 2 - Hidamari ga Kikoeru - Koufuku Hen (Theory of Happiness)
Vol. 3 - Hidamari ga Kikoeru - Limit