A Channel is a 4-koma (Four panel comic). It's comedy and slice of life, it's about middle school friends and their comedic school life. It also has an anime with 12 episodes.
Non Non Biyori is also a manga about comedy and slice of life. The story takes place in the countryside village of Asahigaoka, where many conveniences are several miles away and the school consists of only five students, each of whom come from different grades of elementary and middle school. There's an anime of this too with exactly 12 episodes, but it is getting a second season!
I know this is the manga part of the forum, but I highly suggest watching Non Non Biyori as the manga is well-updated.