Slow Starter (2006)

Blurb:
Jiro Kusunoki had always admired Yoshiyuki Kurihara from afar, drawn in by his slender frame and his big, beautiful eyes. Jiro joins the track and field team in order to get closer to his crush, but finds it difficult to keep up, as Kurihara always runs alone to isolate himself from others. Jiro perseveres, however, and the distance between them slowly starts to fade away…

In addition to the main story, “Slow Starter,” this masterpiece collection also includes three heartbreaking short stories.

Source: www.anisearch.com/manga/25934