Yogo Tomohiko was the son of Yogo Hiriko, and became the Yogo Daimyo after his mother. He created the Tansaku family, after Yogo Tansaku's prophecies about Hiriko's curse happened because she didn't hear his advices and the way to avoid it, and was forced to retire. Tomohiko gave the Tansaku the mission of studying the family curse in order to predict and eventually find a way to avoid it or decrease its consequences.