Charon(2004)

Original title: カロン

Yuto Kawasagi works at a bookstore. She also lives as Hideko Katsuki, newly wed to renowned author Dai Katsuki. She is also Charon, a high-class prostitute working for her lover, gangster Michio Jigen. When Dai discovers her secret life, she disappears, and both Michio and Dai set out to find her.