Sōichi Mogami

Sōichi Mogami (最上 宗一) was a member of Border and Yūichi's mentor.

Plot
He was briefly mentioned in chapter 19, and was the "acquaintance" of Yugo.

History
Sōichi was a formal Border Agent. He also was Yūgo's rival. He used his life to make a Black Trigger, the same trigger which Jin has right now. He used to be Jin's advisor.