Reia Tsubaki

In the manga, Reia and Ginko's mother were very close until she died. In the anime, she started to write a book called "The Moon Girl and the Forest Girl." She died from being eaten by a bear before finishing her book. The bear was Hakone Yuriika. They were close friends until Reia had Kureha, When young Ginko escaped along with Reia's necklace, Reia was mortified by Yuriika.