Mimi ni Nokoru Kimi no Koe wa

From Psycho Pandas:

As graduation gradually approaches, Miyoshi, a high school student, finally gets a chance to talk to a fellow classmate alone for the first time since they met. Due to the other student, Arai, always sleeping after arriving to school early, he's never really had a chance to meet him until now when their time together is limited to the short period before graduation. Meanwhile he realizes his latent feelings for Arai. Arai, however, has never had an interest in school or friends, and he only really had one joy in life...