Setsuko is listed as a supporting character in the cast section of "Aoi Kioku: Manmou Kaitaku to Shounen-tachi". Details regarding her narrative function, personal arc, relationships, motivations, or evolution within the story are not documented. The name "Setsuko Shibuichi" shares its spelling with a staff member on the production, who served as storyboard artist and character designer. References to characters named "Setsuko" in other media are unrelated to this work.