Nana Komatsu (小松 奈々, Komatsu Nana?) is a fictional character in the manga/anime series, NANA, by Ai Yazawa. She is the titular "Nana" of the series, along with Nana Osaki.

To disambiguate between the girls, the English-language publisher of the manga, VIZ Media, uses Nana K. to refer to Nana Komatsu.

Source: Wikipedia