Sensei

Master is a female employee of the Horses Bone bookstore. She received her nickname Master when she first announced to the others her dream of surpassing a master mangaka one day. Master is actually a doujinshi mangaka in her spare time drawing and writing under the pen name Jona Taro who Umio is a big fan of. Appearancewise she wears glasses and has long black hair. She lives alone in an apartment.