This article is about the bonus story. You may be looking for the character.
Naoki (story) is extra chapter and the first chapter in volume nine of Nana.
In this additional chapter, Naoki tells the story about his childhood years (from his 2nd year of Junior High, around 14 years old), creation of light music club in his school and eventually formation of Trapnest. Also, there shown pieces of life of Takumi (13 to 14 years old), Reira (13 to 14), Ren (12 to 13) and Yasu (13 to 14) in those days.