Ashita, Kimi no Mono ni Shite

Yuki is a quiet, average boy who falls head over heels for the confident and cool Hayato in his new high school class. The two hit it off with an easygoing friendship, but when Yuki realizes that a female classmate has a crush on his friend, he tries to put some distance between them. As his feelings come to a head, he finally confesses to Hayato... who confesses right back!

(Source: TOKYOPOP)
Note: Includes an extra chapter.