Character profile
Sachiko Tanaka
田中幸子Kisaki-sensei / Kisaki Tenjouin (天上院騎咲)
Biography
Sachiko Tanaka is one of Junichirou's students and skips school so she can work as a mangaka under the pen name "Kisaki Tenjouin." Laid-back and apathetic, she appears especially invested in her fans, though she does sometimes care about her classmates. Junichirou is an enthusiastic reader of her manga Shuumatsu Gakuen.
Story spoilers
After her character arc, Junichirou succeeds in bringing her back to school, where she continues working on her manga much of the time.
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