Nana is a highly popular Josei manga series written and illustrated by Ai Yazawa. It tells the story of two young women, both named Nana, who meet on a train to Tokyo and become roommates. Despite their contrasting personalities and backgrounds, they form a deep bond and support each other through the ups and downs of life, love, and pursuing their dreams. Nana is known for its compelling characters, emotional depth, and exploration of themes such as friendship, identity, and the music industry.