Bank-King summary:

That night, Hyodo family mansion was mysteriously burned to ashes, taking the souls of the old Master, his son, and the wife. Fumihiko, the grandson survived and is now living a life as Kanzaki, the married young banker who was demoted to an archive department. Little did the people around him know that the ordinary salaryman was a man with many faces who've been scheming the greatest revenge in Osaka for years. One by one, the chess pawn of Hashima, Inc. and Meiwa Bank, those who responsible for Hyodo’s family death was subdued forever by Fumihiko with his lethal deception skill and a game of money...