Before going bankrupt, Daisuke was an economics professor at Heisei Financial University where Kimimaro and Hanabi study. He had two children and a wife who was soon to give birth to a third one. However, after losing to Kimimaro, his children disappeared with no one remembering them, including his unborn child. Soon after that, his wife left him after losing hope to have children with Daisuke. Instead of lashing out on Kimimaro, Daisuke tells him about the meaning of bankruptcy and the future that is taken by Midas Bank as collateral, asking him to never go bankrupt, so there is at least one person other than Daisuke who remembers his children.
He latter attempts suicide, but is stopped by Kimimaro. He explains that even his thoughts escape him, literally leaving nothing in his future. Shortly after that, he dies after being hit by a drunk driver.