The wraparound jacket band on Tsuyoshi Yasuda's 20th DAYS manga volume revealed last Tuesday that the manga has 4.5 million copies in print.

Yasuda launched the series in Kodansha's Weekly Shōnen Magazine in April 2013. Kodansha will ship the manga's 21st compiled book volume on March 17, and the 22nd volume on May 15. The series inspired Saori Otowa's DAYS Gaiden spinoff manga, which launched in Kodansha's Magazine Pocket manga app in October.

The story of DAYS centers on two boys who were never meant to meet: Tsukushi Tsukamoto, who has no special skills but secretly hides a passionate heart, and Jin Kazama, an isolated soccer genius. On a stormy night, the two meet, and that meeting creates a whirlwind in the world of high school soccer.

A 24-episode television anime series based on the manga ran from July to December. Crunchyroll streamed the anime as it aired in Japan. Ponycan USA plans to release the series in the United States. Weekly Shōnen Magazine revealed in December that a sequel for the anime series is in the works. Amazon is currently listing that limited editions of the manga's 21st and 22nd volumes will both bundle DVDs.