Kiss×sis (キス×シス, Kisu×shisu?) is a Japanese seinen manga written and illustrated by Bow Ditama. The manga originally was printed as a one-shot in January 2004 in Kodansha's seinen manga magazine Bessatsu Young Magazine, and began regular serialization in the same magazine on December 11, 2005. As of May 22, 2009, four bound volumes of the manga have been released in Japan. An original video animation episode by Feel was bundled with the third manga volume released on December 22, 2008.