After the Rain

Akira Tachibana is a soft-spoken high school student who used to be a part of the track and field club but, due to an injury, she is no longer able to run as fast as she once could. Working part-time at a family restaurant as a recourse, she finds herself inexplicably falling in love with her manager, a divorced 45-year-old man with a young son.
(Source: MyAnimeList)
~~ Adapted from the manga series "After the Rain" (恋は雨上がりのように) by Mayuzuki Jun (眉月じゅん).