Yotsuba&! is a Japanese manga series written and illustrated by Kiyohiko Azuma, the creator of Azumanga Daioh. It has been serialized since January 2003 in the monthly magazine Dengeki Daioh by ASCII Media Works, formerly MediaWorks, and has since been collected into 15 tankōbon volumes. It depicts the everyday adventures of a young girl named Yotsuba as she learns about the world around her, guided by her adoptive father, their neighbors, and their friends. Several characters in Yotsuba&! were previously featured in a one-shot manga by Azuma called "Try! Try! Try!" The phrase Yotsuba to means "Yotsuba and," a fact reflected in the chapter titles, most of which take the form "Yotsuba and [something]."

Azumanga Daioh is a Japanese yonkoma comedy manga series written and illustrated by Kiyohiko Azuma. It was serialized from February 1999 to May 2002 in the monthly magazine Dengeki Daioh by MediaWorks; three additional chapters were published in Shogakukan's Monthly Shōnen Sunday in May 2009 to celebrate the manga's tenth anniversary. The manga was first released in English by ADV Manga, and later re-issued by Yen Press.