Ao to Kagerou

Makoto's favorite childhood memories are of playing baseball with his best friend and former teammate Shuusuke, the catcher of his baseball team. When Shuusuke suddenly moves away, Makoto is left devastated, but clings to the promise of the two of them someday reuniting at Koshien Stadium. Now in high school, Makoto is the star pitcher of his high school's baseball team, and he and Hokuto, the team's catcher, are an all-star duo. But one day, Shuusuke suddenly transfers to Makoto's school, and now baseball isn't the only thing on the boys' minds under the scorching heat of the baseball diamond...

(Source: Kodansha USA)