Days (stylized in all caps) is a Japanese sports manga series written and illustrated by Tsuyoshi Yasuda.

Days follows the struggles of Tsukushi Tsukamoto, a shy, clumsy and bullied teenager about to start high school.

Tsukushi surprises Jin by showing up after running almost ten miles under the heavy rain and without one shoe, after another run-in with his bullies.

Short, young and clumsy, Tsukushi plays incredibly bad but keeps running throughout the whole match despite having injured his foot, showing such an effort that it motivates his other teammates.

[10] A spin-off manga, titled Days Gaiden, was published on the Magazine Pocket online platform from October 12, 2016,[11] to May 3, 2018.

[18] The original animation DVDs (OADs), depicting the All-Japan High School Soccer Tournament's Tokyo Preliminary Round with Tōin Academy, were bundled with the limited editions of manga volumes 26 to 28 on March 16, May 17, and July 17, 2018.