Itazura na Kiss (イタズラなKiss, Mischievous Kiss?) is the popular, unfinished manga series by mangaka Kaoru Tada. Itazura na Kiss began to be serialized and published in 1991 by Shueisha through Margaret Magazine. It became successful very quickly and became the manga series that Tada became known for in Japan[citation needed]. The manga became so popular that two live TV series have been made so far in 1996 and 2005, with a sequel of the 2005 drama set to be aired in late 2007. Despite its success, the manga was never completed due to the unexpected death of the author in a house accident while she was moving to another house with her husband and son. However the manga series continues to be published with the permission of the late artist's husband[citation needed].

A drama CD series has also been released in 2005-2006. An anime adaptation was started in April 2008 and is scheduled to contain 25 episodes. It is emphasized that the anime adaptation is distinct from the manga itself. In an interview, the late author's husband, Shigeru Nishikawa, revealed that the manga's intended finale will be conceptualized in the anime for the first time. Scripts regarding the plot of the anime will follow closely to the late author's planned ending.

Source: Wikipedia