Forgetful and good-natured Run Momoki has been best friends with Tooru Ichii since childhood. Despite Run being one year older, her carefree attitude and popularity with the boys is a constant headache for the overprotective Tooru. To complicate matters further, when Tooru applies to the same high school as Run, she finds out that their little circle of two has grown into a quartet. Their new acquaintances—Nagisa Tennouji and Yuuko Nishi—are classmates of Run and, in Tooru's eyes, the two must prove they are trustworthy. As a new high school year begins, the girls balance their friendship with the exhilarating opportunities of school life. [Written by MAL Rewrite]

A-Channel was released on Blu-ray and DVD in six volumes from May 25, 2011, to October 26, 2011. The series was published in the same formats in North America by Sentai Filmworks on January 27, 2015, and February 28, 2012, respectively.