Weekly Young Magazine
"Kissxsis" is written and illustrated by Bow Ditama. Ditama launched a one-shot in Kodansha's "Weekly Young Magazine" in 2004. "Kissxsis" was then serialized in Kodansha's now-defunct bimonthly "Bessatsu Young Magazine" from December 19, 2005 to August 11, 2008. It was then transferred to "Weekly Young Magazine", being serialized from September 29, 2008 to December 7, 2009. It was transferred to "Monthly Young Magazine" (rebranded title of "Bessatsu Young Magazine") on December 9, 2009. It was on hiatus between the August 2013 and January 2014 issues. Kodansha has collected its chapters into individual "tankōbon" volumes and released them under their KC Deluxe imprint. The first volume was published on September 6, 2007 by Kodansha. As of June 17, 2021, twenty-four volumes have been released. The manga is also licensed in Taiwan by Sharp Point Press.