Mushishi Temporada 1 Episódio 20

Ginko arrives at a secluded place, to meet an old acquaintance, who seems to be in charge of a large volume of archival, confidential text. Ginko is allowed to read it, and discovers it is the work of Tanyu, a writer. Tanyu is the descendant of the Karibusa family, being born with a black mark on a part of their body.