Tsuda was an architect who also owned a bank. He believed that many great lords were in debt to him when, because of proxies, they were actually in debt to Okumichi no kami Genji.
Tsuda discovered the leather-cover trunk that contained the unusual scrolls while digging a foundation for a Christian chapel near Cloud of Sparrows Castle. He told Emily, Hanako and Taro that he had sent the trunk directly to Genji by a courier. The courier reported that Genji examined the contents and ordered he trunk taken to Emily's study.