Kenichi Matsuyama (松山 ケンイチ Matsuyama Ken'ichi, born March 5, 1985 in Mutsu, Aomori, Japan) is the original portrayer of Shinichi Okazaki in the first Nana film. He did not return for Nana 2 and was replaced with Kanata Hongo. His real given name written in kanji as "研一".