Mushi-Shi S01 E20 A Sea of Writings

"The cycle of life extends beyond the world we can see and connect us all in unexpected ways."

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 Tan'yu, a writer. Tan'yu is the descendant of the Karibusa family, being born with a black mark on a part of their body.