Before very long, currency reform and the introduction of modern financial systems would make the moneychangers redundant, but meanwhile Tokushichi I learned his trade under his master. Their business relationship developed into a personal relationship, and, when he was about 21, Osakaya adopted Tokushichi into the family. Tokushichi's filial role did not last long: Yahei Osakaya died in 1871, the same year as the adoption.