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Sensei (先生) is a female employee of the Uma no Hone Bookstore who lives alone in an apartment.
Appearance[]
She wears glasses and has long black hair.
Background[]
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—whom Umio is a big fan of.