Barbara manga. Digital Manga describes the series' story:
Barbara opens with famous author Yosuke Mikura wandering the packed tunnels of Shinjuku Station, where he makes a strange discovery: a drunk woman, her rags caked in mud, who can quote French poetry. Her name is Barbara. He takes her home for a bath and a drink, and before long Barbara has made herself into Mikura's shadow, saving him from egotistical delusions and jealous enemies. But just as Mikura is no saint, Bar
bara is no benevolent guardian angel, and Mikura grows obsessed with discovering her secrets, tangling with thugs, sadists, magical curses and mythical beings - all the while wondering whether he himself is still sane.